A body exhaust manifolds.

Fisher said

I am sick of dealing with headers, i am no longer concerned about losing some HP. Which Big block exhaust manifolds will fit in a 71 duster with a B motor? Are they hard to come by?

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You can search out this post here on FABO about C Body Big Block Log style exhaust manifolds in an A Body.

There are a few modifications to make them work, but they do work as explained in the articles and replies to the post below.

Relatively inexpensive too compared to the A Body HP manifolds. Have seen them on craigslist for under 100.00 for the pair.