Narrow escape from radiator leak, 91 GMC V2500 Suburban

[rocky_mtn_man]

Looking for some local references for a good radiator or radiator/AC shop.
I'm in Boulder, Colorado. Also tips on how to pull the radiator.

Was doing a short tow from Superior with hill climb and long descent into Boulder, check engine light came on and I was overheating. I was able to park it fairly quickly and still had burgling coolant in the block when I parked with the engine over a curbside snowpack. Took two gallons to refill, and when I drove a mile to repark I must have lost most of it (leaks under pressure). I replaced the radiator cap, that might be why it puked faster. I won't be able to test for a head gasket leak until I fix the radiator and can test the pressure.

The leak is from the center bottom, not the tanks or hoses. Can I get a radiator shop to put in a new core? This was a replacement radiator which I put in when I bought the beast in 2001. 5.7l with AC, 4WD, 3/4 ton

The AC has never worked (except when I replaced the compressor, and my mechanic tried to do a conversion, which leaked out in days). I've heard you should stay with r-12 and put in a parallel flow condensor, so this might be the time to do that project.