Based on your photos (and HIN number), I beiive your boat is an early 82.
Must be. Defiantly not a 84 or 85 with that dash. Looks like someone cut an access hole behind the passenger seat (good idea). I can't remember if my 82 came with a drink holder, my old 83 did. Ski king? The hole next to the mirror was probably added to. I also. Can't remember when they started gelcoating the bilge area. I don't think my 83 had it either. Must've been in 84