I had a mid 70s Precision that was the best sounding bass I ever owned and stupidly sold thinking I was done with 4 string basses. I've owned a lot of basses, but I also owned am 80s SVT head and 2 "baby SVT" cabs with 2 JBL 15s in each, but it sounded better than my Alembic Epic 5, Spector Euro 5, and Ken Smith Burner 5 through the same rig. By a large margin. I also have a mid 70s Stratocaster (hardtail) that is the best playing Stratocaster I've ever played, easily on par with the CS stuff coming out today. The only problem with it is I hate the way Strats sound, I'm a Les Paul guy, but the Strat belonged to a friend who is no longer with us so I keep it around.
Auto dismissing the '83 because it's a CBS bass could be a big mistake. Unplayed I'd probably take the newer one, but if I had a chance to play them both there's no way I'd pre choose one over the other. All things being equal, if they weighed about the same, played about the same, and looked about the same, I'd take the older one. Unless the newer one had a graphite rod reinforced neck, then it would have an edge. Why would I take the older one all things being equal? When the newer one is 20 years old, the older one will be 50. That's cool to me.