Intake manifold - corvette?

[chewiebarker]

The number on the intake manifold for my '71 Sub is "3973469 GM2". The only info I can find online is that it is for a 1971 350 with Rochester 4bbl (which is what my truck should have per spid)- but that info comes from a Corvette site.

I have heard of people swapping in corvette engines/parts on our trucks, but supposedly this is original to the truck. What am I missing?

Did GM make different intake manifolds for 350s depending on which vehicle they were in, or were they all the same?

I haven't been able to get access to the rear of the engine to fine the block numbers, yet.