What rear gear?

4.10s

The ratios are 2.74-1.57-1.00-.67od

65mph will be 2070 with zero-slip, that's pretty low for a performance engine.
The starter gear will be 11.23 which is equivalent to 9.30 corrected to a 24" tire. I run a corrected 9.75 and it's perfect.
Kicking down into first at 32mph will be 4400@5% slip, and that is a rocket
Hitting 60 at the top of second will be 4700, a little low but 5.38s were not on the option list.
106mph will be 5300. This for 350 hp. A little low but 4.56s were not on the list
111mph will be 5550. This for 400 hp. A little low but 4.30s were not on the list
116mph will be 5800. This for 450 hp, just about perfect for a streeter
Second gear is good to about 81mph,a little low, but 4.56s were not on the list.
72Dart@3600 raceweight, street suspension, 5% TC slip.
I looked and found a set of 4.56. I'm not against buying a gear set if that is what I need to do.