Thanks for the part numbers, I'm not sure where to go from here? I have a Motor's Truck Repair Manual, Second Edition, and it states # 1 at TDC and 90 degrees from the cam key way should be 13 teeth to the crankshaft gear mark, which it is. So according to the book its in time. Could flywheels be different from chevy's to gmc's and still fit? Thanks, jap
