My personal opinion would be 3.08 gears. In a truck with a V8, 1634 rpm would be close to lugging... however, your Vic has a much lower
Cd and drivetrain loses, you should be fine cruising around with that engine speed.
I would go 2.73
only if you are planning to do aero mods that would help it roll down the road easier.
As the others said, try to find either a complete axle or scrap car. You'll recoup your loses quicker
