Low compression "build" and cruise rpm?
The Performer RPM is taller than the Performer. You'll want to ensure you have enough room to close the hood. The 3.23 is nice for all around highway cruising but will still allow you to burn tires from a standstill with your big block & light A body car. I know you said you were not concerned about gas mileage but what is your budget for building your setup? Putting the right parts into your engine for your intended usage is important. You don't need a cam that makes the engine rock like a thrashing machine to make good power and have excellent street manners. Not saying the whiplash cam is like that, but my point is the engine and car is a system so build your engine, transmission, and the rest of your setup for the intended purpose and you won't be disappointed.