904 or 727 in 66 barracuda

J Glenn said
Dumb question: anybody tried a A500 trans in that body-style? My understanding is that the A500 is a A904 with overdrive (and the A518 is the 727 with overdrive).

The A909 (a 904 with lockup converter), the A500 (904 with a fourth gear added to the rear of the case).
Google is our friend . . . lol . .