From what I have read here (I think my eyes are bleeding at this point) the Early A 273 manifolds will not fit the 302 heads without some shaving off the head or manifold. I mocked them up and sure enough it is true. My original plan was to use the 273 manifolds and order the complete single exhaust from Accurate. Is there a later manifold, shorty header that comes out in the stock locations that would marry up to a Y Pipe? Or is TTI/Dougs dual exhaust the only way?