So I am in the process of rebuilding a 96 vortec 350. I have been searching for rebuild kits and was getting confused about differences between and older 350 and the vortec engine so I wanted to post on here to get yalls expertise. From my understanding the vortec is a gen I block with different heads and the crank has a one piece rear seal. So could I buy regular gen I parts such as pistons, rings, bearings, timing chain, oil pump, and should only be concerned with different gaskets? I have found different part numbers for oil pumps and timing chains and wonder why if the block is the same.