1968 Dart rear end with 2.94 gears

I got a 2.76 with one busted axle bearing, just swap one side out of your old rear, you can have it for free
for what it's worth, 2.76 vs 2.94 is about 150 RPM distance at 70 mph (2600 RPM calculates to 69.5 mph with a 26.4" tire in 3rd and a 2.94, 2450 RPM calculates to 69.7 mph for the same tire.