Need Exhaust Recommendations

GTXperience said

BTW: '73 340s used 360 exhaust manifolds, correct? Do they by any chance have the same headpipe flange angle as a 318? If I could just bolt these up, that would be fantastic. Can anyone think of any other issue(s) with using this exhaust on the Dart?

Click to expand...

Many years ago I ordered a direct replacment 340 pipe set from Big A auto parts for a 70 340 Duster. Turns out it must have been for 73&up. Drivers side fit fine, but pass wasn't even close to my 70 HP manifold. I had a late 70/early80s 360 pickup motor in storage so I pulled that pass side manifold and it was a perfect matchup to the exhaust pipe. My guess is 318 is same angle just different pipe flange.
Hoped that helped clarify part of your question.