[iwantacobra427]

Jim:
I'm finishing up a 331 which is fitted with AFR 185 heads, Comp 280 HR Magnum cam, forged crank, Air Gap manifold, Holley 4 barrel carb, etc. The engine will be mated to a TKO600 0.64 OD and I'll be running a 3.77 diffy. Initially I was leaning toward the 0.82 OD with a 3.54 diffy but figured the other combo was better for the driving I'll encounter..
-Jack