rear end ratio to make happy rpms at freeway speeds

Hi y'all

I have some gearing questions for you. I have an A-833 overdrive transmission im putting in my cuda. Im also slowly collecting the parts to shorten and rebuild an 8.75 rear for this car. I would like to get a ring and pinion that would allow me to have fun with the car in the lower gears , but allow the engine to run around 2300 to 2500 rpm in top gear at 70 mph. I will b running a 15" wheel with low profile tires diameter to be determined at this time. I was thinking either 3.55, 3.73, or 3.90 gears. I only am asking this as i want to buy one set of gears, and have the diff set up one time.

Anybody here have any facts on this one,

Thanks
Matt