90 GMC 3/4 ton ifs SB 400 carbed 30 over 70 cc aluminum heads restroked after market summit crank comp cam 5.7 rods 1.6 rods roller rockers clevitte H series berings Demon 750 headers dual 2 1/2 w/ flowmasters TRW forged flat pistons. 6 inch RCD lift LTB swampers