My experience is that old film develops best in the developer it was made to be developed in - so with 1983 films, I'd suggest D-76, HC-110, ID-11, or something like that - something that would have been around in 1983. I would not recommend something like TMax developers. And that might be the rub - the only labs that still do B&W near me only use TMax developer. Talk to your lab guy and see if he has any suggestions, too.
The films will probably be fogged a bit, so I think I'd give an extra stop of exposure.
juan