How much should a basic 340 rebuild cost?

ha napa....it really comes down to the machinist ...the napa gut in easton pa was ok
my guy (his shop is 1/4 mile from my house) lucky me charged $900 for my slant head new springs hardened seats guilds ect. so i'm thinking $1200 for my 340 heads
it all comes down to how good is he
We had a really good NAPA machine shop in Perry, Georgia years ago. It was run by a retired WWII aircraft machinist.

What I would do is try and befriend a machine shop. I have a couple near me. One, I've known the owner literally all my life. He doesn't like doing automotive gas work anymore, but he will for me if they can get to it. I also will offer to help in the shop if they need it....and they always do. He knows I can still do most machine work and I usually mill a head or two or do a valve job, or I've even swept up. Just anything to help. You'd be surprised how far that kinda thing goes.