I just helped tune a 600 hp engine this weekend. It is a 508 with Trick Flow heads, Holley Sniper EFI, hyd roller cam, etc. Made 620 on the dyno. It is in a '70 RoadRunner with a four speed. I got the Sniper dialed in and we went for a drive. The owner couldn't do much more than breath on the pedal before the rear end started to come around. Even in third gear the rear was breaking loose when he started to accelerate. He wanted 600 hp but I'm a little worried that someone is going to kill themselves in that car.
