@fish stink I built a 440 powered 70 swinger back in 87/88 and at the time fenderwell headers were pretty standard. They were a set of hooker 5205’s
It was a S6 car so cutting it up wasn’t a big deal. Here’s what I learned.
I hacked up the inner fender wells pretty well for clearance. Had to swap the master cylinder so the lines exited on the right side and made a nice heat shield to keep it from getting baked.
Elephant ears for mounting but I used rubber from a bias ply tire wrapped under and on each side of the ear to give it some insulation. Front tires were 195/75/14 on a 5” wheel and the front torsion bars were cranked up pretty high to keep the tires from rubbing on turns.
The exhaust was hard because nobody ever heard of 3” exhaust and bullet mufflers at the time so they were reduced to 2 1/2” and went right down the side and into “cherry bomb” style mufflers and just a turnout in front of the tires.
I looked for pics of the car but much was lost in the “great divorce of 1990”
Best of luck but with the current crop of under chassis headers and finding nice 50 year old mopars to build I wouldn’t go that way again, well maybe.
Cliff Ramsdell