Pick this up yesterday.. 1971 Swinger, Slant 6, 904, 7.1/4.
Waiting patently is a 390 stroker, a 727, and 8-3/4 Sure Grip.
That said, I'm considering EFI and a centrifugal blower on a Slant 6, with the 904, and the 8-3/4. Strictly for the street, though, and for local car shows.