I joined a couple years ago but just recently acquired a running 1956 Mercury 312 that I plan to put in a 1954 Customline.  The engine is stock and for now it will just be a driver/cruiser.  I tried searches and found mention that using an adapter on the A intake to use a later holley would require some blending.  Additionally I know that the B intake has larger ports than my ECZ-C heads so I assume that I would need to port match the heads if I switch to the B intake.  (I will be using a later distributor from a 1958 parts motor)  So from a drivability/power standpoint, would it be better to just use a WCFB, use an adapter for later Holley, or switch to the B intake?

Given the fairly low CFM requirements of the engine, has anyone ever done a comparison between a small 4bbl and a large 2100 2bbl?

One more question:  I am currently using the 1954 3spd standard, but will be changing to a later model 4spd.  Would it be better to use the original 54 flywheel, or the flywheel from my 1958 pickup truck engine?

Thanks in advance for your help.  James

1962 Fairlane, 1954 Customline, 1949 IH Pickup