A friend of mine made 800, with a GM 350 block, splayed caps, out of the box 200cc pro 1's, and a Procharger. He actually made that number with a GM steel crank too, but has since gone to an aftermarket 4340 crank. Another buddy of mine makes 650+ on spray with a stock 350 block, crank, and rods. Stock stuff will take some amazing abuse, that is if the tune up is right....