Michael, I have a roller cam 305 from a TPI Camaro and a 1972 vintage 350 from a Nova; one of them will go in my 58 Burb. Not sure yet which I will go with as the wife is thinking the 305 may be more economical but the 350 can really produce some torque which should allow you to keep the rpms low. Both will need some work before they are ready, the 350 is a fresh short block but needs heads and the 305 was pulled from a wreck in mid-life (~60K).

I saw some info on the NV4500 and would be interested in hearing your experience on making this swap. What parts were necessary, what rear gear did you decide on, etc.