Here in Dallas we have a big shop like American Muscle it's called Dallas Mustang. The shop also has a website http://www.dallasmustang.com
They also do service/installs. They might be a another good site sponsor like American Muscle.
Idk how far you're from lewisville but there's another performance shop up here with really good reputation but just like DM I've never got anything done by them either it's called HPP racing.. You prolly heard of them before