Exhaust Manifold, '74 350

[White10hat]

I have a 74 GMC, 350 2bbl. Both my exhaust manifolds are cracked. I need to replace them. I was wondering if anyone knows what years they are interchangable for if i was to go to the junk yard.

I live in NJ so the pollution isnt that big a deal. I may remove it anyway.

Thanks