I know 53 4 me's distributor did the old ally oop when the engine ran and he had a slight hesitation in it when he started out. He sent it out to rebuilder and he swears it's running like a new truck. (That's because it basically is a new truck!...lol)

Anyway, the rebuilder will put all new bushings in it and get it all trued up and running right. That's the place I'd go.