Should I swap the 3.91's for 3.55 or 3.23

I went with a 2.76 in my 8.75 with a 340 4 speed.

Awesome cruising gear. 2600 RPM at 70 MPH with a 235/60/14 tire.

Just took the car on a 2 hour trip each way to the cottage with my wife, 2 daughters and the dog and it was very, very enjoyable.