Just bought a smoke machine.

dano said
Yeah no gaskets on them. And FYI the EFI 7.5L (460) has different heads than a 86 (I think) and down 7.5L. The ports are different. You can tell the EFI heads by the center bolt down valve covers. The Exhaust ports are raised and smaller than the older stuff so you might look at the manifold castings and see if the part numbers are correct for the year. As I recall the old stuff bolt on but do not line up.

I think those years and numbers are about right, as I bought a '95 (?) EFI 460 about a year before I bought the truck (to put it in my '68 F250), and it's sitting on my engine stand:

And if it turns out I do have a cracked manifold (in the '92) I'm kinda hoping and praying that I have the part(s) to fix it on-hand.