New bottom
I know that peeling the bottom is a little on the OCD side of preventative maintenance but not knowing what was going on under 20 years of bottom paint was enough to keep me awake at night. We found 12 blisters after the peel, 6 on one side, and 6 on the other all in exactly the same place, a problem during lay up I guess. I will finish it with an industrial epoxy made for oil rigs, military vessels, and such, it's 25% less expensive than the name brands and they are the only company to manufacture a high build, water proof epoxy primer.
The additonal costs of peeling the boat apposed to scraping it were well worth it and the results are great. Aplly one coat of primer, fair and it's ready for bottom paint.
As for the rudder, based on the line drawings that came in the manual it appears to be the stock set up for a 1987 E-34.