Cost of rear end rebuild? Shops in Orlando?

I'm looking to change out my rear gear from 3.42s to 4.10s. During this, I'm thinking of having the whole deal gone through. What would it cost?

- Install of 4.10s (I'll provide them)
- Install new bearings and seals.
- Possible rebuild of carrier (it turns at 25 ft. lbs, and I think spec is 40?)
- considering rotating spring perches on axle to get proper pinion angle for cruising.
- Axle tubes welded? Worth the trouble for a car running high 12s (with 1.80 short times)?

Any input would be appreciated. Any alternatives to the old standby of Advanced Driveline?

Todd