Chiming into this a little late, but in short if you haven't found a tuner yet JPC in Millersville, or even Booz Brothers Racing in Marion PA also have good reputations. Horsepower by Herman is also a tuner in Maryland and has been doing Fox Bodies for decades.
Personally, I would stay away from Maryland Performance Center. Been working with these guys for years and have had more issues than success, and have spoken with others who feel the same. PM me if you want further information.
2014 Shelby GT00- Oxford White/Sonic Blue Stripes
1995 Rio Red Cobra #2021 - SOLD
8.8:1 comp. Dart 331, Procharger D1 16psi, AFR 185, Edelbrock RPM II, custom cam, TKO, Glenns 1000hp fuel system.
690rwhp on Mustang dyno