yes
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Not always. You haven't said what kind of 350 you're talking about. Is it an LT1? Is it a Vortec? Is it an LS1? If you said yes to any of those then the answer is likely "NO" for LT1 and definitely "NO" for the others.
Yes it will. It will bolt right on... 100% interchangeable.
Yes, they are 100% interchangeable, so it will bolt right on.
Unlike chevys 305, 350, and 400 which are interchangeable. The Ford 302 and 351 are not interchangeable.
yes
the manifolds should be the same for the 350and 305. be careful, however about the year of your manifold, older manifolds have the four center holes drilled at the same angle as the heads and the rest of the holes, newer manifolds have the four holes drilled straight up and down, and the two are not interchangeable
The connector into the intake manifold of a GM 305 and 350 has been known to be quite fragile. If the connector has broken you have little choice but to replace the manifold.
Yes they are the same.
yes it will fit, 262-400ci chevy smallblock manifolds are interchangeable.
no, the bolt pattern on the small block Chevy intake manifold changed in '87 to the vortec head design, but if it doesnt have the centerbolt valve covers, then it will.
yes
yes
yes it will fit, any smallblock Chevy intake from 86-55 are interchangeable, the 86 and newer have bolts that go staight down instead of on a angle