Oil Pan Clearance
2-1/2" is quite a bit to loose but on my Cuda the hooker headers hang down much lower than 2-1/2 past the stock oil pan so I could go 2-1/2 inches deeper on the oil pan with no problem. How low do your Mopar perf. headers hang? Also what style is the pan you have? Is it the style that has the sides kicked out. If so I've heard nightmare stories from every guy that had one trying to get the engine in with it on. It hits the K frame. Some guys notch the K frame and others put the engine in and then install the pan which isn't fun at all.