Danny,
Have you checked out the
oldGMCtrucks.com discussion board? You have to be a member, but the initiation ceremony is not painful.
Bill (Miles) recently had a 302 "built" and professionally dynoed. All of the work/testing/adaptations are chronicled in a thread on oldGMCtrucks.com. The information posted there is not about old "foreign war/engine" stories - it is about a GMC 302.
I think that one problem they had was the #6 cylinder piston got tight because of non-uniform engine/block heating/cooling.
You might be surprised/impressed by the compression and horsepower discussions/considerations.
If you join that site, and read that thread, think about where/how to buy the parts/pistons (and, why).
Good luck - keep us informed on your progress.
