Garvey Auto Shop on the corner of Garvey/Humbert in El Monte. You should really check them out first. Might be good enough for my Chevelle i'd have to think twice about taking my 3.0 there.
If I was more savvy on what exactly you're doing I could give you my 0.02. For example, I had them machine my crank bearing guides, rebore my piston chambers, and they worked on my heads. I contemplated having them machine my valve bosses (or whatever I needed for a higher lift cam) but decided not to because they did have older equipment with the thought that older equipment have worse tolerances. Hope that makes sense.
My 350 block was $250, heads were $400 on craigslist - lots available. Relatively pennies compared to a NA1,NA2 parts. He did all the machine work for under $300. VERY CHEAP!
They also farm out some of the work if their shop can't handle that particular job. Anyway, I don't know the address but they're right next to a Pho.
http://maps.google.com/maps?f=q&hl=...592,-118.057831&panoid=4OztpX9qrzTs9VYfhQqhYQ