I know this is probably a topic that has had much disscussion, but I searched the archives and can't find my answer. Not too long ago, I remember reading about using D/S exhaust manifolds off of early Tbirds that would fit on 61-64 yblocks trucks. I think that someone even posted part nos (maybe numberdummy). I know that rams horn exhaust wiil work, but I haven't had any luck finding a set reasonbly priced. Maybe I'll have better luck with this search!