I have a 72 GMC with a 6.0L and a 4L80E behind it. Im trying to find a header that might fit. Anyone else tried? I bought a used set of 98-02 f-body Mac 3/4 length headers thinking they might work. The left side hits the frame rail and rubs the bellhousing area. I could make it work with some work. The right side hits the frame, engine stand, and hits the bellhousing/ trans area. Cant see a way to make it work without cutting it up. I have never attempted to build a header and would prefer to buy some, but dont wont to spend a arm and a leg. Can a normal small block header be made to work by changing the flange and spreading the center tubes? Anyone have this combo with something that fits?