I'm sure Classic Air can rebuild that RV-2 but, I suspect it's going to be very pricey.
Some general things about these compressors- From the factory /6's usually got the smaller displacement compressors which are RV's. V8's got the larger displacement RV-2's. Once parts got into the aftermarket rebuilt area they were interchanged freely and just about everyone calls them RV-2's. Original compressors will have a metal label across one of the heads marked with compressor type and serial number. Many parts interchange but, of course displacement determining parts do not.
Shaft seals, gaskets sets and front bearings are still available. Internal parts are getting hard to come by. About the only thing that kills these compressors is running out of oil. If I had one that still turned freely, I would consider freshening it up a bit and running it.
These systems were designed for R-12 refrigerant which is now getting harder to come by, expensive and you need a certificate to by it. So, most systems are going to be converted to the newer R-134A. To do that, O rings should be changed to R-134A compatible types and the oil in the compressor needs to be changed.
On a RV type compressor, I would Change the front shaft seal and O ring and remove the oil sump pan on the bottom of the compressor. Check the condition inside and if clean refill with and ester based oil and reinstall the oil sump with a new gasket.
A factory service manual will show all the details on this compressor.