If it still has the wacky rubber isolator/adapter between the carb and intake, I would almost bet that's 90% of any carburetion issues. Both regular Mopar and MP used to offer a really nice solid-aluminum replacement but as far as I know it's been discontinued for years. I had one on my '86 Charger and even had a spare one "just in case" for several years, but Lord knows what happened to that one. As was often the case, the MP part was less expensive than the Mopar piece.
The design of the induction system does not allow the carb to be bolted straight to the intake. :eusa_doh: Just posting this as what may be helpful information regarding the carb issues, either for you or a potential buyer. It looks like a nice little ride.