Holy crap!

Truly wonderful from a stock 400 block!

My Moparmate had a Koffel 547ci with a 71 400 block.
Made over 900hp and another 250hp of NOS on top.
If you look at my avatar you can see the car it was in.

8.30 at 180 back in the early 90's...
Pump gas as well, Koffel is a GOD!!!