I found another newer shop in rowlett called Pickle Performance, they dont seem to have a real website but they do have a facebook page and respond reasonably quickly.
I got a quote recently from Precision mustang performance out in forney. The guy who runs the place Noah has worked on cars for me before, so I know he is honest and does good work. I havent contacted any other shops to compare pricing but what he quoted me didn't seem too far out of line...