Building a surprise 67 Cuda for my Pops

Son2PopsCuda said

what are your takes on 3.91 gearing for the 7 1/4 ? too much? is it over kill?

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The 273 will be very peppy with 3.91s, and they are perfect to hit 60 mph @about 4400rpm in second gear. Very peppy. And yes it will probably need a SG.
'Course, 65=3300ish cruising