3:23 or 3:55 gears?

I have 3.53's in my 65 B'cuda and at 70 MPH I am spinning around 2800RPM's with 15 inch tires. This did get my 19.2 mpg in town though. I havn't taken it on a long trip yet to get hwy mileage.

If your going to keep it under 60mph 90% of the time, go 3.55's. If your going to see the highway at all I would use the 3.23's.

Jim