I've got a set of the Kenne Bell Stainless on a car now; but just got another car. I bought these headers from a guy that was going from Stage I to II. Never had any fit problems; although the Stage I had 14 bolt heads and they had to grind the plates to fit around everything.
The little I dealt with Jim Bell was strange at best. Very smart guy; but wasn't always in the best of moods. I never figured how he made any money off the Buick folks with the small volume he sold. Maybe he saw the Chinese coming; and dropped it all.
Anyway; they had at least three versions of headers that I remember. Steel 84-85, steel 86-87, and stainless 86-87. At the time; I was bugging him for a set of stainless 84-85 headers. I sold the 84's and had the 87 like I wanted it; so I quit calling Jim. Probably didn't bother him much. Now I have a new toy and wanted to fix it up like the other. I'll probably try the ATR or maybe just see what the Chinese have. I like their food.
Thanks for the info,
Joe