Offhand, here's one with a video. They listed it like 3 years ago at 22k with a single, but new, Suzuki engine. Looks to be in 'fair' condition... albeit they literally did not clean it up to list it..but. You have a 34yr old boat with original 2-stroke engines. That means someone is either going to be looking for an inexpensive boat, or they will want to repower, so. NADA puts retail just under 9k. High end List is 34k, but to get to get that, you would contend with boats at least 1-2 decades newer, so I would say 10-15k, max....not seeing more pictures.
I could be wrong.. but, it is not an easy sell with 2-strokes these days.
GL and hope ya get a nice Grady!
Russ
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