On my 70 Challenger, I had the engine in and jacked it up from underneath. Placed wood blocks between motor mounts and where they bolt to the k-frame. Passenger side was easy (from the top) but the driver side took patience. Starter was removed as well as the steering column. A few tweaks (slight denting) to allow clearance for p/s gear box and done. They are Hedman Headers, non-coated FWIW. GOOD LUCK!