Model number help!

[Haydenriley8836]

Recently ended up with a jet boat with an omc engine in it. Boat is a 1977 but unsure of motor. Can anyone tell me the year/basic specs by the model number? Model number is 990318R. Serial number is W272760. Just trying to get a general idea of what I have in case I need to get some parts for it later on. Any help would be appreciated!

 

[Bondo]

Recently ended up with a jet boat with an omc engine in it.

Ayuh,..... Welcome Aboard,..... I had such a Starcraft years ago fitted like that, an OMC badged small block Chevy, spinnin' a Jacuzzi jet-pump,.....
Never did anything with it though,.....