So are you saying the only things that ARE interchangeable are the oil pump, rod and main bearings, pistons and rings? Everything else will have to be vortec specific? What about the rods themselves, and I have a brand new timing chain and windage tray sitting on the shelf. I am going to be putting on an intake and carburetor and this is going to be swapping out a v6 in a 1994 single cab c1500. I want to beef up a 350 and figured this would be a good candidate because it was a roller engine. I have several older 350 but they would have to be machined and I was hoping to save that money to put else where. I'm not looking for high horsepower but want to concentrate on getting as much torque as my dollars will allow. Any suggestions?