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I'm in the same boat. I'm dropping mine off this weekend to get the 650hp package from 21st Century (only because I can't afford to do the 675 yet). I priced parts out and to get anywhere near what they can do, it would cost the same if not more in parts and I'm not about that. like mentioned above, if you do aftermarket heads then you have a bunch of other stuff to add/replace and I'm all about maximizing the efficiency.
I do my own work in almost all cases, but time (FT work AND school), plus the $$ as mentioned has me giving it to a shop that will give me a warranty and get it done in 5 days.. Not to mention their rep as a leading LS7 shop in DFW speaks for itself. I'm very comfortable with my choice.
As for the ceramic coated headers, I have zero recommendation for your area. I have a buddy here who does amazing powder and ceramic work, but that would require you shipping to and from. You may have to do that anyway, but just throwing that out there.
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