In 1987, your boat was part of the "Sport Cruiser" line of Sea Rays. The manuals weren't model specific. The link below contains the manual that would have come with the boat. It says 230 Weekender, but if you go through the manual, it has page 13 where it lists model specific information, with yours included.
https://owners-resources.searayweb.com/owners-manuals-files/1987_230WE_230WE%20Manual.pdf
