It's a pretty simple operation - find out what butterfly you need (that's the hard part!) find a decent machine shop, and disassemble the throttle body and take it to them.
A boring operation is standard mill work, and can be handled by any competent machine shop - it need not be an automotive shop. Probably cost you about an hour's labour - maybe an hour and a half.
If it's an HO throttle body, you have a lot of options to get either a prebored unit or to send yours in - RENIX is a little harder.
I don't know any shops in the Sac'to area, or I'd point you to one. CRASH is up there - why not give him a PM and see what he has to say?
5-90h