As zombywoof mentioned, the narrow necks used back in those days is the first thing that comes to mind for me. If you get along okay with that narrow nut and it sounds good to you, then I wouldn't be too concerned about any of the other stuff (provided it's in decent shape).
I was visiting our local Gibson dealer a while back and to my ears one of the best sounding Gibsons they had in stock at the time (regardless of price) was a '68 reissue J-45, complete with an adjustable bridge. It sounded far better than it "should have". As always, it comes down to the individual guitar.
All the best,
Guth
