Dougs D453 headers went in ti my 70 Dart yesterday....

Ditch the factory steering coupler and put a 3/4 inch aftermarket one on that will save you a little toom, break the grinder out on shaving corner or gear box and heat wrap wires...headers on mopars are a pain in the..ya know
I had to clearance the lower ps box bolt, and maybe a Lil box mount area. Also, a Dimple here and there.