You have to be INSANE to have long-tube headers on a big-block A-body Mopar!

GRANCUDA said

While most cringe, I have only found 1 negative(cut fender wells but I kept the sheet metal I removed),

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I had a set of those in the 80's. Never again. Tires rubbed (even small 195/70R14), low ground clearance at the flanges, hot on the feet...
Edited to add: really close to the master cylinder. I tried it on a 440 and had to make a relocating plate. Body clearance even worse with the RB.