I am rebuilding a 312 for my truck. I have a couple of oil pans from later truck 292's and one from a 272 with a windage tray in it. I think it was a 272 HD on a 2 ton. The pan from the 272 is the best but wondering about the windage tray interfering with the crank, rods, oil flow for the 312?. The tray sits down 2 inches from the oil pan rail. The other oil pans are all open with a divider at the deep end.