I would call a couple of piston manufacturers and see what they say about the needed ring pack and pin height required for the boost and cam you want to run. The more boost and the bigger the cam, the thicker the piston, etc. Ditto on the rods and crank. Sonic check the block. Then I would try to bend the ears of a couple of guys pushing these motors hard with boost to see just where the problems come up an how to build the motor to take it. You never know where this project will end up years down the road. Speed is addictive, plan for more boost/hp/cam now inside your budget. I look back at my last drag motor build and know that had I done it differently, I could be pushing 1100 hp instead of 880 hp for a few thou more. Good luck with it.