Whos running a 5.9L Magnum ?
I run the 380 crate with tti headers, Bigs carb, M1 single plane, 4 speed, and 3.91s in my duster. Going from 3.23s and a demon carb with non functional vac. secondaries to the 3.91s and Bigs carb with mech. secondaries was a huge change. It's a blast to drive but I might drop some IMM EQ heads on it in the near future.