Well, that basicly depends on what your car's motor is built into. 3.42's out to work well, but let me know what set-up your running, and if you plan on going street cruising or straight drags. I have 3.23's in mine, and I'm swaping them for a set of 3.73's I have laying around because mine's not a driver anymore. 3.42's should work well though.

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4 Firebirds, mines a 69 Firebird 400 R/A III (soon). Volvo Racer in the works, and just a little bit of everything.