Exhaust Manifold Question

[FoxHound]

Hey all,

I've got a 72 Blazer with a stock 350 sb with stock exhaust. Last night I was changing out the donut gaskets that sit between the exhaust pipes and the bottom of the exhaust manifolds. Got 5 of the nuts off, no problem. The last one decided to seize up. Long story short, the stud sheared off and now I need a new manifold. I'd like to just find one at a junkyard or a pick and pull lot. So, my question is, what range of years did the factory manifolds bolt directly onto my motor? Can I use one from 73-87 truck running a 350? I really doubt I'll find a 72 GM truck with a 350 sitting at the yard, never had that much luck before. Any help would be great, thanks. Oh, and it's a 4wd with A/C. I understand there's a difference.