Just bought a used 3/4 ton PU Block#3970010 Head#'s 14014416 and 354434. Worth putting a comp 280H cam in. Plan on a 2800 stall speed, 400 trans. Not sure of the rear. Huge 16 bolts or so. Not sure of the gearing. Truck is a 84 chevy C-20. Looking to create a tire burner with a nice sounding engine.