In the NorthEast it would be Tasca Ford. There should be a SouthEast shop in Florida but am having trouble recalling the shops name. Then there is/was the Georgia shop but I'm not sure of their current status.
Don't confuse the current generation of mod-shop with the previous generation of mod-shops. The majority of current mod-shops can NOT build CSM numbered cars but are able to perform non-CSM builds like the GT/SC.
And before anyone asks, no I do not have a list of the current mod shops. All mod shop questions really need to be directed to our sales department for proper handling.
This post made me think about who and who isn't a Shelby mod shop. Old days it was Tasca, Quantum and SAI. Now, I guess the question for me is who outside of Shelby in Las Vegas is an "Authorized" Mod shop. That can badge or designate cars as Shelby GT/SC cars that gets the designation in the registry and the GT/SC side stripes. I know Tasca can do the upgrades, but I thought they were no longer a Shelby "Authorized" Mod shop??