74 Duster transplant exhaust

the passenger side will clear ok, if you can find an e body drivers side manifold, it will clear on the drivers side. i used a 71 challenger 318 manifold, with a mini starter ( 87 dodge dakota starter )and went to a muffler shop that put the exhaust on my 74 duster, i have a column mount automatic, and ran 2.5 duals with turn down chrome extensions at rear bumper, biggest problem is tailpipe between gas tank and springs on passenger side, the gas tank is off set to the passenger side to make room for spare tire space in trunk, takes a good exhaust person to clear that one, i couldn't move springs due to wideth of rear tires and back spacing on rear wheels. My passenger side manifold was off a 92 dodge, so i don't know if that will make a difference and i used Shumacher motor mounts with the original slant 6 k frame.