I would use a XR292HR-10 Comp Cams, factory heads can make up to 750 HP with the right work. We did this with the same basic setup your going after. The heads were 452's with 2.14/1.81 valves and a mild port job. Nothing drastic.
http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1444&sb=2 This cam? That looks like a good cam. I do plan on running 4.10s with a 3200 stall. Now what lifters do I need. Sorry for all the questions. But cam specs and such is beyond my knowledge. Dose your shop do this kind of head work? Im only asking to get a idea of what it cost to have done.