u could try PSE in north houston, i think. power stroke enginuities. try a google search. u'll find them. ask for Dorian. he'll take care of ur powerstroke. tell him Dominic from facebook sent u. he'll remember me. lol.
I'm way late on this one, but just in case anyone searches this thread up... Diesel Innovations is easily one of the best, if not the best 7.3L shop in the area. Second choice would be PSE though. Dorian seems like a cool guy.