3K or 25K? It don't matter you run it hard, it's going to BREAK! If your only looking for 600 HP i'd go with a crate engine. I had a good freind that ran the Chev 572 crate engine(700 HP) with a 400HP fogger setup and he ran it for years (and he ran the hell out of it!) but sooner or later your going to launch something. The faster you go the more it will cost and the more it will break, Sucks but true.