Here is a calculator that I used for my build project.
Drag Times Gear Ratios Calculator, MPH, Top Speed 275/40R17, 3.23
This link has my wheel/tire combo with 3.23 rear gear and 8HP70 transmission.
It calculates Speed and RPM for each gear through my set red-line of 6000 RPM.
Plug in your own numbers to get the results for your setup.
May not be my final setup but looks like a good starting point.
This is with a 6.1 G3 Hemi in a 69 Barracuda Fastback. Might go with a little taller tire but this is what we have on the car now. Car is not road ready yet. Got the engine and transmission installed a couple weeks ago but still a lot more to do.
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