I run a (or should say I ran) a 3:73 in a Ford 9" in my Nomad -- with a 700r4 -- and it was PERFECT but that had rather small diameter tires at 25.6"
The Mustang runs a 3:89 rear but only a 4 speed.... so that's no comparison.
Can't beat a 3:70 for all around good gear ratio IMHO.... or you could run a 4:30 like my little '32.... LOL Nothing like a good gear in a short wheelbase lightweight car! Yippppeeeeeeeeee
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