I think that 983 is pretty close. Your airplane needs to go on a diet. I'm thinking the original builder was thinking 0-360/CS and didn't mind adding a few extra lbs.
here's where I think the weight is coming from;
1.) mid 70's era avionics dual com 11a(s), Nav 12/11 (plus glideslope receiver for the 12) ... + 10 lbs (see pic)
2.) Your Wing tanks are actual integrated 'tanks' rather than wet wings .. I bet that adds 10 - 15 lbs at least plus the plumbing, fuel pumps etc ...
3.) You have a very nice and complete interior, that adds up too. Also note custom cast rudder control assembly and brake pedals.
4.) The Blaupunkt speakers in the side panels (5 lbs at least)
5.) The FAR 121 quality transponder box and HUGE landing light in the tail cone 10 lbs (see pic)
Tail Cone Note, heavy Light and FAR 121 grade transponder.
6.) Unless you filled the wing tanks yourself at some point I doubt there was any residual fuel in there ... it sat for a long time.
Please don't take offense your airplane is a work of art (again see pic everyone ... it's a beaut!) but you are going to have fun trimming the fat.
