Thank you everyone for your input. Very helpful advice.

Any drop in low end torque using a stock and unported aluminum Mummert or Blue Thunder intake with stock ECZ-G heads is small.  In most cases it will not be noticed in normal driving and adding a one or two inch four hole carb spacer is expected to restore those subtle losses.  You can figure on a 25-30HP gain in performance with one of the aftermarket intakes in lieu of using a stock ECZ-B intake.  In defense of the iron intakes, here’s the link to the YBM article on a 292 build using the ECZ-B intake manifold on a set of unported 113 heads that still makes over a horsepower to the cubic inch.
http://www.eatonbalancing.com/blog/2015/05/01/unported-iron-heads-can-still-make-over-a-hp-to-the-cubic-inch/
 
Regardless of the intake manifold being used, carburetion will be a key factor in overall drivability, idling characteristics, and full throttle performance.  Here’s the link to a previous Y-Block Magazine article where a variety of carburetors were tested on an ECZ-B iron intake.
http://www.eatonbalancing.com/blog/2012/09/25/four-barrel-carburetor-testing-on-the-y/
 
If the heads are ported, then a higher flowing intake is needed in which to complement the work done on the heads.  This is where either the Mummert or Blue Thunder intakes really outperforms the factory iron manifolds.

Lorena, Texas (South of Waco)

If you aren't porting the heads the b will match it. The cam about 5200-5700rpm's, I would say a tight LSA 107/108* to gain some lower torque and it to be set 4* advanced. A wider LSA 111* is better for higher power-bands and single plane manifold etc.
And therefore if you choose mummerts manifold then perhaps you should include a set of mummert heads and a cam of his recommendation.

The stock B manifold should be great for what you want to do. The Mummert would also work but no need to spend the money for it for what you are going to do.

64f100;
I modified a B intake and then used a phenolic spacer on my 331 cu. in. blower motor. I made the modifications using a hand held, right angle die grinder with a carbide burr, but a milling machine would give a more precise cut for sure.

Rono

  Ron Lane,  Meridian, ID

Since you are using a T5, leave the 3.89 in there.

RE cams, it simply depends on what you want out of the engine.  The bigger you go, the less low end you will have and the more top end you will have.  Further, the bigger you go on the cam, the more important it is  to actually build the engine to use that cam and that can add up to quite a bit of $$.  You will need to increase compression, you will need an aftermarket intake, you will need better exhaust, you may need to make improvements to the cooling system, etc, if you want it to reach it's full potential. 
If you won't be towing or hauling and you can tolerate the lopey idle and increased noise, then go with something bigger.
If you want something better mannered for street use or you do plan to haul or tow, get something smaller.



Lawrenceville, GA

Would one of Mummert's y-280 cams be a better cam with b intake and g heads? I'm not sure how often the engine will see rpm over 4k. I'm concerned I might lose bottom end with Mummert's intake, that might not be the case though.

Thanks.

I run a b4v int. with eczg heads(rebuilt) new holley 550cfm,cam is 57 312 grind used with refaced lifters bore is .040,left the rest as i bougt the car ,no blowby or seal leakes. was going to rebuild a 292 from scrath but my 57 rancher runs so well, i am holding off,oil p is60psi at 2400.axel is 3.25. dist is converted to ford dura spark 3spd manual at2400rpm i am doing 60mph. from a ligt it is fairly quick. i am amased how it will pull down to 600 and just hang in ther. now the weight of the ranchero  should be a bit over a 56 pickup?. not sure, i am surprised at runing lower gears as some have posted,but as our fuel is 1.30 cn per ltr. with price so cheap in the us i would be tempted to try lower gears ,esp with a 5sd or od.

Thanks Charlie, I guess I should have mentioned that I plan on a t5 transmission conversion.

The B intake will be great for a street build

Since your thinking of a cam in the 270 area, which will probably be mid 220s @ .050, keep the 3.89, at least until after the engine swap is complete and you've had a chance to try it out.  I think 3.55 with a cam like that will be too tall and make it a little sluggish around town and you can pretty well forget about hauling or towing anything.

I currently have 28" tall tires, 275/60-15 and a 3.70 with a cam that should have a similar power range to Mummert's 270.  70mph is about 3000rpm.
I'm planning to try a 4.11, to help with the low end, which isn't terrible with the 3.70 but I also have overdrive and I think more rpm will help for better economy there.  Currently 70 in overdrive is only about 1900rpm.



Lawrenceville, GA