My set of hookers fit with no cutting of inner fender. I just pulled it out a bit with my hand for clearance. Not a big deal.
Back in the late 70's all thru the 80's and into the early 90's,if you had anything out of the ordinary(sbc or bbc in an a,f,or x body or sbf or cleveland in a mustang fairlane or torino) or had an engine swap Hooker was the man,most of the other guys didn't offer much selection.Nowadays there seems to be as much or more choices as there was in the 60's-early 70's.I always liked hookers but it was probably mostly because they were available.Yes,that one tube goes outside of the frame.Hooker is a "Decent" header,fitment can be annoying.