cam suggestions

So you think I should go with the bigger cam?

I don't know? Do you want more power and torque?

I really haven't thought about the rear end gears, What do you guys think?

A 8-1/4 rear is up to it for handling most power issues in most car/engine combos not to mention there very cheap next to the 8-3/4. I got mine for $200 with 3.21's and a sure grip, though it had no backing plates. (Which suited me fine since I have 11 inch drums complete set up)
If your looking for mileage, 2.76's, very common
If your looking for performance with some thought of Hwy cruise and decent mileage, 3.23/3.21
Performance, 3.90's - 4.10's