Okay I got my car on the road and I need more traction than my current set up is giving me. Can I just change out the gear set and convert my rear end to a posi traction with out any other modificaitons? Is this a difficult task to master? Or would it be cheaper to go find a posi rear end and change the whole thing?

It's a '65 chevy, coil spring mounted, 10-bolt (I think).

Thanks.