2 Questions

my first question.is for all the people who run big blocks in their a Bodies..and have headers thru the inner fender. .how much should i cut???? how many inches from fire wall should i go and how far from the fender should i go??? dont know if that makes sense . i dont want cut just to cut . . cause i stll want it to look fairly clean. . . . .. . . . . .SECONd question HAS ANYone done a taillight panel replacement on a DUSTER. i plan on getting a used one from another FABO member. .and its cut enough to where i have metal to work with. . wat is the best way to go about doing this. .and what type of weld should i use . .like a BUTT-weld or Step doWn weld thanks all input is appreciated
-Stephon