Hello guys. Anyone have any experience with Dougs d313 headers? My 70 454 th400. Passenger side header hits the lower rear a-arm frame bracket. At first I was super happy and impressed with these headers! NIce finish, thick flange, and went in fairly easy. Than I lifted the car to put in trans mount bolts grabbed tail shaft to push to passenger side and realized header making contact with hanger. Dougs days install tall engine mounts. But that makes it worse , can’t push motor back already to close to firewall. I have one other option that might work but would rather not. Or I have $600 in headers I can’t use.