What's the cheapest way to install and exhaust system on a big block a body

If I were doing a A-body big block swap, I would assume it's for performance reasons. To me, a vintage non smog performance car needs headers.
So, my budget answer would be: a set of cheap, uncoated big block b-body headers, as many "adjustments", dings and dents as it would take to make em fit, and a cheap jegs or summit chassis specific header -back kit, with whatever mufflers I want to run. (I would probably run jegs or Summit. Flowmaster knockoffs, I like the tone, as big as I could fit under the car.)