I assume the Express version with the tall cabin and smaller cockpit? Not a lot of hiding space in a normal one, just a single cozy berth. If it's the Express, that's a lot of boat for a motor under 5 litres. I looked at repowering my 20 out of curiosity, and rebuilt 5.7's with the twin barrel carb seemed to be the best value. Considering it already had a rebuilt 5.7 with a twin barrel carb, I didn't bother.
Handles better at slow speed with a Bravo outdtive, but either way, will wander a lot at low speed. The broad beam and the massive transom with a relatively flat hull towards the stern means you have to pay attention at the wheel when going slow.
The flip side is that broad beam means the boat isn't tender at all, even with three adults leaning over one side and nobody on the other.
Nice boat regardless. Post up some pics of the refit as it goes along. There's a Limestone Facebook group that's semi active, and if you need parts, they might be able to help. Medeiros still has contacts for some of the parts suppliers they used, but not sure if that extends back to the even older Hinterhoeller boats...