I started getting my parts sorted for my EFI conversion recently. I found that the blown engine I had bought for parts is a late EFI, the manifolds with it are early ones. Does anyone know if the early manifolds can be opened up to the late ports?

If not, does anyone on here have a set of late EFI 460 exhaust manifolds for sale? I really don't want to mess with headers on this having lived with a set on my 66 GT350.