74' Stephens Motoryacht

Hello All , I'm looking at purchasing a 1983 74' Stephens that's located in Seattle. The boats been sitting for several years with limited maintenance but is in overall pretty good shape. I've spent some time trying to research the boats history and have have come up blank. I thought maybe someone here could possibly shed some light on the boats history, it seems to be a wealth of knowledge. Any info on Stephens Yachts in general would be greatly appreciated, as well. One of my main worries is that it has an external exhaust system that runs from the engine room undereath the hull to a few feet short of the transom and there's really no way to know what the condition of the hull is under that exhaust tube, and it on
Obviosly hasn't been barrier coated cause there's no access. What do the experts think?

Yes having a full survey and mechanical and hauling the boat. The way the exhaust runs under the hull I can probably boroscope a couple feet of it but the tube is 15-20ft long. It's really a pretty bad design from what I can tell, but I haven't seen it out of the water yet... My plan is to try and audioguage some of it from the inside, but getting access to most of it is going to be difficult. I also have to make sure when we haul it that the exhaust runs outboard of the tanks and not under them which would cause a whole other set of problems of course. I'm hoping somebody from the west coast maybe familiar with the boat.