What Can Be Dome With a Chrysler 400?

I'll vouch for the 400. My dad's running one with home-ported iron heads and an Edelbrock RPM...I think he's running the Mopar .509 cam. He put it together around 25 years ago and he's had it apart twice to change bearings, which it didn't really need either time. He did this back before you could get high-compression pistons for it, so the deck and heads have been shaved quite a bit to get the compression up. He consistently spins it to 6500, though it's seen 7000 more than once. It pushes his Challenger to low 12s, though I think that 11s are in the cards this year.

I love 400s 8)