2bbl /6

Yes the heads are the same between 1 and 2 bbl motors. If the aluminum 2bbl intake has a welded on top use the iron one. For a year or two they made an alumium 2bbl manifold that was two pieces welded together. They had serious porosity problems (causing vacumm leaks) with these and they stopped using them.

There are after market cast aluminum 2bbl (and I think some from the factory) if that's what you have might as well take advantage of the few pounds weight savings.