Gear Vendors in 69 Dart

Here is a link to an easy calculator. dragtimes.com/gear-ratio-calculator-mph-speed
Filled out for my tire size with 275/40/17 tires, 8HP70 8-speed and 3.23 rear gear.
Just edit the table on the left and hit the calculate button. It will calculate MPH and RPM for each forward Gear.
Need to fill in your Tire size, Rear Gear, Each Gear ratio of the Transmission you want calculated.