Unless that engine has dish pistons, wouldn't that Voodoo cam tend to increase the possibility of detonation ?
With flat top pistons, those engines are listed at 10.25 CR.
http://www.wallaceracing.com/enginesearch4.htm
"...ra4 copy , rhoades lifterts as well .. love the sound but as you know does really devolp power until the upper rpms..."
That has not been my experience at all. In my 455 bracket engines, the power range was from idle to 5000rpm, although they would go to 5500. I'd estimate the hp at 400 @ 5000 rpm, and the torque at 500 @ about 3000 rpm. But, I had the 72cc heads on most of those engines. Don't know if the extra compression made any difference or not. I don't think so, because my 1st 455 came out of a 70 GTO. It was the original engine, so it had the #64 heads. The only change I made was the RA4 clone/Rhoads swap. In a '68 Bird, with a TH400, 13" stock converter, & 3.55 gears, it ran easy 12.40's & 50's, launching from an idle, & shifting at 5000.