We have been running A 75 stock 225/6 with over 100,000 miles, full body 72 TwIsTeR 3,170 pounds. The first pass 20.2 after A few mods, PowerPipe-DC Exhaust Manifolds, 2BBL carb, Pertronics dist kit, curv kit, 3200 10" converter, 3.91 now 8 3/4 we are running 27" tall tire, The stock cam pulls...