I have a 80 and a 95 model H16. There are very few differences in the 2. That is the nice thing about Hobie staying strict on that one design class. Probably the biggest design change was the integrated main traveler track in the back crossbar that was changed in the early 90s.. As far as the 80 to 85 models go, I don't think there were any changes during that time. If I remember correctly, Hobie did start making the 16 a little lighter around that time. That was also about the time they introduced the EPO rudders. But all that was more to sell more boats to the hard core racers. Other rigging differences you would probably see in 16s would be modification made by someone that raced it. Maybe added cam cleats for the jib travel system or an Ausie haylard system.

But these things aren't essential to just having a good time or making it go fast... Going fast has more to do with the "loose nut on the tiller".