Help with ID on this Grumman

[SouthBuffFish22]

Hey all. Just purchased this 18' Grumman. 1987, says GSX on the side, 140 HP OMC.
That is a custom Amish top on her.
Can't find much of anything online about her, not even in NADA. I'm away for work right now so I can't take measurements.
I emailed Grumman (Marathon) And got back a reply that said she is indeed a 1987, GSX184. Again, can't find anything online specific to mine. Rep stated they made an I/O and a outboard model of these. Any help would be appreciated, especially from those who've owned or own this model and can send pics. Thanks, Jay

 

[ZinToledo]

Hi Jay,

What are you wanting to know? My father recently passed his 1988 Grumman GSX to me. He purchased brand new. I'm not sure what the differences between 1987 and 1988. I too can't find much about it online but fortunately have all of the original books/manuals.

Zin