For what it is worth…..
I sold a 1988 one just like that, only 14 foot, with an 1971 25HP Evinrude on a Shorelander roller trailer for 1500.00 back in 2006.
Taking in all the different years, it at least gives you something to go on.
By the way, it was a real nice boat, that I wish was still in my garage for some occasions.