Dana 60 questions

Emailed Dr Diff with a few questions, but have had no response. Ordering a Dana 60, is there any reason to go with other than 1/2 x 2 studs on a street car? there were quite a few options. Also, for a street car, Trac Lok is the best choice, correct?

Last, any input on gear ratio suggestions I would appreciate. Building a 73 Barracuda with a 6.1, a41, Dana, 245/45/17 tires. Thinking 3.73 after getting advice from a few guys, figured I would poll the audience one last time before spending this money.

Thanks

Jason