I modified my tank and the stock truck pump to work. I went with a weldtech pan and I'm using the stock truck starter. Since you have a 72 you will need the older style mounts if you go with TTI like I have. I modded my k frame to use the angle oil filter adapter. Everything is a very tight fit. I'm using the factory wiring that I modded myself. It took time an patience, but saved me from dropping the cash on the hotwire harness.