Rear gear recommendation for highway.....

2.73 gears with a 42RH overdrive with converter lockup.
15 inch tires at 26 inches tall.
It's set up with governor pressure switching for fully automatic OD and lockup and gets 25mpg at 90mph and 2k on the tach.
This winter I hope to get the 8.25 locker with lower gears, but it's a freeway killer for sure.:D
8 miles to the gallon better than the 318 and 904 but now has a 350+hp naturally aspirated Magnum in it.

It's also a lot quieter inside the car so it's easy to let it get over the speed limit.
The