It is still a bit of a haul, but there is Country Club Automotive in Glen Burnie, MD.
The person that owns it is the Former National Tech for Maserati North America also working there is the Former National Service Manager. They both worked for Maserati North America during the DeTomaso era from the Mid 70s thru the early 90s. So they know their way around the GT cars as well as the Biturbos.
It is not a big place, and they are not the fastest at turning cars around, but they do know what they are doing. Please let me know, if you are interested.
Also they do all the work on my cars
Ghibli SS # 2110
Khamsin # 1226
Mistral # 1216
Bora # 1046
Islero # 6243
Mondial Cab # 49713