Benzmobility has a great reputation but I don't think that he'll want to work on a '77.

I recommend Ken Redmond @ The Benz Store on Buford Highway. Google "Benz Store Chamblee" and you'll find him. Call him first - I'm sure he can get your '77 running. I know it's not the area you want but our family can vouch for the quality of Ken's operation over there.