Great information you guys. I love this part of moparts. I learn a ton every time I hop on the Race forum!!! The 516's are in better shape than the 346's and will just need a quick cleaning and reassembly unless they are warped. Not too sure how stout the springs are yet. The only thing bugging me is the pistons. I don't want to dump money into this thing if I could be building my stroker but that will push the finish of the car until august. If I can squeeze 425 hp out of this motor, I would be happy. With the low gears, I will be able to lots of tire damage with that.

Will I kill performance with the 2" headers?