Like a lot of things with race engines it depends on how much you want to spend. The weak point will be the block and you can use a girdle and be good to maybe 700HP or you could install steel middle cross bolt caps and get a littel more. Then the cylinders become your next problem and you can fill the block to help them. At what point do you just buy a good block and save money other places. Your Edelbrock heads would work fine and you would not want to run any bigger valve than the 2.09/1.66 valve because of shrouding.
We make close to 750 HP with the Super Stock 428 engines and they have factory ported heads, 11 to 1 compression and stock 735 carburetor all mandated by the rules. So with 14 to 1 compression and highly worked heads with a large roller camshaft, T&D rockers, aluminum rods, lightweight pistons, vacuum pump, roler cam bearings, good oil pan, nice intake and carburetor you could probably make 2HP per cubic inch but would it be worth the cost to do all of that. This just depends on how much you want to spend and the power you want to make. There may be a easier way to get there. Good luck, Keith Craft
