kj, Where are you ?? Do you have the opportunity to get on an Interstate and go for a 120 mile one-way drive to lunch ?? (You want the engine guts, oil, coolant, fuel system up and running, hot and stabilized for quite a while.)(Best time for an oil/filter change would be at the end of this day.......)
Long shot......... Find a 20 oz. jug of Chevron TECHRON (a powerful fuel system cleaner) and dump it in with a fillup of Chevron, Shell, EXXON, Texaco, Shell 93 octane gas. Hit the road - do a few WOT's in the process. Lunch. Go back and do it again. Clean fuel and exhaust system.
Do NOT use seafoam or any other snake oil, and do NOT use concentrated TECHRON any more often than 5,000 miles. Google "top tier gasoline" and "chevron techron" for some reading on a rainy night..............
You have a rare car - get it back in as-new condition and drive the snot out of it. (Not to be confused with abuse...........)