The 20 bolt pans interchange. But the FWD pan has the sump all the way to the rear mounting rail. It wont clear a crossover pipe when installed in a G-Body. And IIRC the kick out for the pick up screen is different between the two. Underdash harness is different. Turbo has a plug for the boost-a-tach gauge on analogs and since the fuse block is part of the harness there are also fuse cavities for the Powermaster,DIS coil and WG solenoid.