i would look for the turbos off a Turbo T-Bird, specifically the 87 version with the intercooler. i see a few of them in the local pick a part yard from time to to time (or a SVO Mustang same thing but harder to find) and think they should work out pretty good.

a 292 is roughly 4.8L and the turbo t-bird was a 2.3l so two of them should feed your 292 pretty easily seeing as the 292 heads are not overly efficient port designs.

but there is lots of info on the net about turbos and proper selection and sizing, so do some research on the subject.

sounds like an interesting project. keep us informed.

Rgds
Mike