To me, 550-600 hp can be bought by just about everyone here if they had the mind to. 400 block, 512 stroker kit from 440 source, trick flow heads or RPM's or whatever, solid roller cam and yatty yatty yatty. And I understand why they do it. But to me the fun is trying to work with an engine, be it 512 cubes roller or 273 cubes stock, and get more... and more... and just a little more... then a eetsy teenie bit more... :D LOL