In Boxborough; Advanced Accessories, (978) 264-9989, Richard is the owner. He knows a lot about old Mustangs and he should be able to make some good recommendations for shops. Richard may also be a good contact to help with your project.
In Mansfield is Mansfield Mustang, I don't know these guys, but they specialize in high quality restoration parts for 390 and 428 Mustangs and should have a good restoration connection or two.
