I think you just block it off with a carb spacer that doesn't have ever port. Or I guess you could drill and tap for a pipe plug. That is what I think I would do.
Dug it out. It's a elderbrock performer 302. Part# 3721. It is used and little dirty but doesn't have any stripped holes or anything. If you want it I'll do $130 shipped to ya.
Re: Edelbrock pro flow injection harness and computer
ive got a BBC and SBC intake like would came with this kit, i'll sell either for $80 shipped. this might help complete stuff above