Custom fabbed headers for a 66-Abody???

I've not really gotten into full blown research on 383/440 headers for a 66-Valiant yet, what I have seen is that these fenderwell A-body header prices are going to stick me with a set of stock manifolds if I don't come up with someting else, thats just "BUDGET REALITY".... Has anyone on here ever tried to modify a set of 55-57 small block chevy fenderwell headers to fit a big block A-body, of course you would have to use mopar mounting flanges and maybe change some angles but the pipes are layed out about the same, chevy headers are dirt cheap compaired to mopar....