Quote Originally Posted by Hopper111
the CR with this piston to head combo is somewhere in the neighborhood of 10.5:1 and the cam is on a 110 degree design.

I'm not really worried about the cast steel crank. I used one in an LT1 engine that we put a 9 lbs. super charger on it. It has been guessed that the engine puts out somewhere in the neighborhood of 650 HP and no problems.
the compression is wayyy to high for a Turbo. you need to get down to 9.5 at the very least, but 8.5 would be best. also Diesel turbos are way too big. you may want to look into Barry Grants Turbo system for SBC's, it's expensive but gives you everything you need, and gains you MPFI.