Quote:


I don't want a Hi RPM race gas motor.




You also want to keep the budget down.
I would get the best cnc B1 originals with 2.30 Tit. valves with PSI or equalent high quality springs with 360-400psi seat pressure. Cam with 0.850 lift, T&D rockers.
Stay at 572cui square engine.
Start with single intake for an possible 1000hp with the right parts compr. and cam and later upgrade to sheet metal intake for a 50hp increase ( twin domin.)

Staying with 2.30 valve at 572cui will keep the rpm lower.

Tom