I used an HD replacement pump from a 1979 T-Bird. Bolted right into my 2.3's bracket. All the lines fit as well. No more whining, it steers easier, and has no problems bleeding. 

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would think if you were to upgrade from a plastic pump, to the metal saginaw for you "T-bird"(hint hint), they would take it for core. I really don't think most places would care, just as long as they had something to send back.
Is the ps configuration on the 4 cylinders the same as the 6 cylinders (2.9 3.0 4.0)