Rear End Ratios

I hope this is in the right spot
im looking to change out the rear end gears in my 64 valiant, theres no tag or anything on the rear end so i put it up on jack stands and turned the driveline and it ended up being 2 rotations of the driveline was 1 turn of the wheel. so im guessing that means its like a 4:1 ???

if so ive found an old service manuel and the standard gear ration was 3.23, 3.55, or 2.76 and i was wondering what to expect from each of these. its the 3 speed push auto (2 barrel 276) and right now it wont go past 60 so i cant use it on the highway much. i would like it to be pretty good for daily driving but have some acceleration too any info would be great thanks guys