500 hp 360 ??

Smells fishy to me...I don't think worked over stock heads are going to flow like that, and I don't think you will get 500hp with a hydo flat tappet (along with the other stuff mentioned). If you do go this route, and the engine really does what he says, you will be running low 11's....my guess is this engine will get you mid 12's at best. Not trying to be a downer...it just sounds like a 400hp build, not a 500hp build.