5.0L exhaust manifold choices

[71fast]

So I installed a new Ford 5.0L engine with gt40 heads in my 71. The old 302 2 barrel exhaust manifolds have smaller exhaust holes than the heads. Do I need to buy 302 4 barrel or hi po exhaust manifolds?

 

[CTGSTANG]

I believe that you could get a set of aftermarket headers that should fit like a glove. The factory style manifolds I'm not too sure.