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Gunnar at ARMCO as mentioned above, is the first name that jumps to mind. Good guy to deal with, although the last time I talked to him he was pretty backed up so take that into consideration.
You might also try Barry Jensen at Bits of Pieces. I've never given him a Norinco to work on, but he's done other jobs for me and they've been absolutely first-rate.
Gunnar is always busy! Most people go to him. Try Rodger Kotanko of RK Custom Guns/ Dark international He does alot working building STI/SVI race and standard guns for alot of IPSC Shooters.
If you want to view my Dark 40 1911 thread i have pics of his work on there.
Barry's pretty busy himself. I think most pistol/gunsmiths who are good at their craft are busy these days due to the fact that there aren't many of them around. Another person to try may be Joe Dlask.