I found a 2bbl carb with intake and exhaust manifolds in the salvage yard they were marked 'Aspen' but the guy did not know what year Aspen.
It did not have an Oxygen sensor on the manifold (if that helps).
Would this be a good set up for an 81 truck?

Sure. You should only need the intake manifold, carb, air cleaner, choke pulloff assembly, and kickdown linkage. This is a great upgrade for heavy trucks and vans with a slant six.

I am not sure all of the kick down linkage is intact, the linkage on the carberator is on the side where as mine is currently on the front.

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Our greatest fear should not be of failure but succeeding at something that doesn't matter.

Is the intake AL or FE?

FE

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Our greatest fear should not be of failure but succeeding at something that doesn't matter.