Not Ranked
I doubt the application matters.
I have 3 of the RAN transmissions in a '67 galaxie behind a 289, a '66 F-100 behind a 352, and a '74 Bronco behind a 302. All are small input, small output but are designed very similar to the top loader. I think you'll be fine.
Regarding the casting numbers, I bet they are fine and not cobled up. The galaxie one has a long tailshaft but no place to mount a floor shifter. I would assume your mustang tailshaft does?
While not a performance transmission by any means, I bet it will hold up for a while at least behind a 460.
Chuck
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