2 part question. pro parts headers and A/C heater box.

I have used ProParts on low decks and RBs. The only difference I saw was the inner fender cut outs were made about 3/4" lower. I actually shimmed the motor up closer to RB height. The blower motor interfered with the passenger valve cover. It was either grind the fins on the valve cover or remove the blower motor. How far out does the AC box extend? I think the headers are well below that point. I also read an article that tells you how to move the blower motor more towards the passenger compartment. Maybe thats a way to go. Hope this helps you.

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