Jeff, I’m sure that you are NOT the only person interested in an original '57 ‘D’ cam or some semblance thereof. IF you're really going to use the engine on the street and highway, how the engine performs in that rpm range is of utmost importance.
The set-up I’m presently working on will use a T-5 trans. with a .73 5th gear and 3.56 rear gears. Using formulas found here in the
Forum, with P205/75R-14 tires, at 70 miles per hour, I’m looking at 3,207 rpm in 4th gear, and 2,341 rpm in 5th gear.
While I like the sound of a lopey cam, I’m more interested in drivability and sleeper-type performance in the rpm range a street (stop-and-go) and road (highway legal speeds) driven vehicle will be operated in. Many factors go into accomplishing drivability, but the camshaft is central to induction, compression, and exhaust decisions. I want:
- a reasonable (mannerly) idle speed
- smooth off-idle acceleration
- good low rpm engine throttle response
- responsive performance at highway speeds
One variable that I have not acknowledged is engine displacement. From my own experience, I’ve seen the same cam perform entirely differently in two different size y-block engines. One was a stock bore 272 and the other a 312 bored to 322. The 322 was much more ‘mannerly’ than the 272.
Another consideration today is compression ratio. More aggressive cams seem to be more street-able IF they operate with a higher compression ratio. Higher compression requires higher octane gas. The cost of gasoline for someone planning to seriously drive their vehicle should likely be considered in the engine ‘build’ if they want to enjoy the ride.
As always, everything is a compromise.

I wish cam selection was less of a ‘black art’ for me as a hobbyist!
If Verne Schumann does produce a new y-block, I recommend that provision for a variable valve timing system be included!
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York