Which Axle Ratio Should I Go With?

[musclecar fan]

Thanks everyone for your feedback. It seems given the fact that I have a 350/300 + Turbo 350 Trans with a 3.07:1 axle ratio, non-posi, 12-bolt rear and 14x7 ralley wheels with T/A 235/60/14 tires, stock dual exhaust with transverse muffler, Quadrajet, stock intake, and Air Conditioning that 3.55's is the recommendation. It's not Posi now. Any reason to change to posi? Not in an Icy state, I'm in California. Not looking to race the car. Just want more Umph to it when I step on the gas pedal. It's super slow now.

If I just change the non-posi 3.07 to no-posi 3.55 gears how much should that cost me for the ring/pinion and labor? Any recommended shop or individuals that can do this for me in Los Angeles area? I'm in Van Nuys. Thanks again fellow enthusiasts.