Im looking for a place that i can get a 3.73 posi rear end for my 1970 elcamino? I want it to be 2 inchs shorter on both sides so i can fit 10.5 inchs tires in the rear. I have air shocks and coil overs in the rear if that makes a difference.

Check "The Rear-end Shop" in Salida? I think. Not sure of the city, not more than an hour away. They are the best, we buy a lot of parts from them. Not sure about narrowing the axle though, may have to go to Alston for that, he's in Sac.