Originally Posted by cobalt327
The idle vacuum doesn't matter as to whether to use a vacuum secondary or DP carb. When you floor it, either way the vacuum drops off to nearly nothing, regardless if it has a small or big cam.
Heavier vehicles and/or higher (lower number) rear gear ratio equipped vehicles are generally easier to drive w/a vacuum secondary carb. Light vehicles w/low rear gears take to a DP like a duck to water and aren't as likely to bog on you.
Either will work (the DP requires a learning curve- think of it as the difference between an AT and a stick shift). But for the street most guys tend to like a vacuum secondary-type carb better than a DP, and the mileage will tend to be better as well.
There's a lot of trickery that goes into a race engine. Glad you know the cam in this engine. I guess it's the heads that nothing is known about and I confused the two. My mistake.
Ah yes, I think I got it!