340 Exhaust Spacers

Wow! I've learned a lot, from this thread I appreciate everyone's input, I saw the D48 on ebay, but the price seemed a little high. I guess my other question would be and this may be a stupid one, but I found a Craigslist a guy selling a 273 intake manifold, that came off a 1988, hesaid it would work. But from what I'm gathering here is that it most likely will not, am I correct? Thanks again all!