Yes he can .....But still new bushing and seal.
Any converter shop will tell you to. In fact most wont warranty their work unless you do your part and give the hub a new surface to ride on.
Bushings are made of a brass or babbit material for a reason. And that reason is to allow for some of wear factor as no hub is welded true.
That current bushing has taken the wear factor of the old converter.A new converter or hub should get a new bushing for that same reason.
