I have been watching this debate with intrest,Chryco perhaps you could clear some things up for me also, I have a power braked 4 speed 3.55 rear challenger with a fresh 440 bored 40 over with stock ex manifolds and I am fitting a new 6pack setup,I am also thinking of Engle K58 with a lobe centre of 112 for street use,do think this would be a good set up? thanks.