I think it might be a viable possibility. Part of the problem might be any difference in the different head port sizes. If, for example, the header tubes are wider on sb ford headers, it might block being able to drill bolt holes in the flange for the poly pattern. I'm going to try it, but I agree that others might have better info, particularly those who have already tried it.

One post on another site suggested welding poly flanges on the ford flange and drilling through the poly flange, but that seems like extra and unneccessary work to me.

Most sites I have searched talk about adapting ford headers to the poly, but I have yet to find someone who has!