I don't know about SoCal, but nobody in Seattle will even look a complete engine built before '90. Too much other stuff for them to work on, and most don't know anything about older engines - gotta have an old school independent mechanic who's been doing this forever, and that = $$$$$.
Have you considered doing it yourself? It's less scary than you'd think, and you'll learn tons about your bike in the process - top ends are pretty benign (as long as you don't drop the cam chain into the case and turn it into a bottom end rebuild ). There are a lot of great resources on here about how to do it.
Given that the winter season is upon us, why not make this a winter project? It is totally doable on your own (although valve work and cylinder honing/broing should be done by a machinist). Check out Saturdays Wrench on Youtube. He rebuilds his CB350 motor step by step.
Watch some youtube tutorials, print out your HSM and re-read the procedure a few times, and then start accumulating parts and tools before you start. I would suggest leaving new pistons and rings off until your machinist tells you if you need to bore out.
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