Those are nice well built boats. On par with champion, and ranger for that year. When I lived in Springdale late 80's there were as many of those on Beaver as anything else. 2 guys that worked for me had them an 86 and a 88. Both guys loved them. Like Xring said you need to put in water to run with load on it to see if it will idle ok. Muffs will tell you that it will start but no load will let it run even if carbs are messed up. Good luck with it and know you will enjoy.
Proud Member of Team Geezer
Charlie Weaver USN/ENC 1965-1979