dumb question , whats the diff...
 

other than the 5 speed , what is the difference between a 86 to 88 930 as opposed to the 89 930

I think thats it

I thought the suspension had to be set slightly differently to accommodate said 5-speed and hydraulic clutch? (1989 '930S' models also had an extra 30bhp.)

But if you want to know year-on-year differences between 911 models, the following book is a great place to start:
Porsche 911 Red Book 1965-2005 (Paperback)

Thanks, I'll pick one up