I was looking at installing a set of Flowtech Headers (31150FLT) on my '79 Trans Am with the Olds. 403 engine. It has power everything and factory air. Has anyone else installed these same headers and did you experience any fitment issues? I have read other strings where people have had fitment issues with headers, so I was curious if anyone has tried these. Or if you have a suggestion for a header that is a solid fit.