What companies will do head work on a set of 3.4 heads I would really like to have a set worked over. I think that and a cam maybe a stall and I maybe done with my little 6.

 

Just do them your self.
If you don't want to use your heads that are on there now go to the junk yard and pull a set off a 2.8 or 3.1 ( there all the very same heads ) and get a valve remover tool take the valves out and be ready to replace any bent valves and port away just don't hit the water jacket.
It's not hard to do.
I'm taking my 3.1 RS over seas with me along with some 2.8 camaro heads I had to abandon working on to come here but will restart the project a long with others when I go home and head over seas.
I had 1 bent exhaust valve and will most likely replace them springs and all.