You might ask your insurer before you look for a surveyor, some will require a survey done by someone on their own list. In which case you might want that one to be the survey, instead of doing it twice.
If it is a gasoline engine you can assume the carb needs to be benched by now. If it is a diesel...welcome to a new world.
In either case, depending on the plumbing it is not impossible or unreasonable to run it on the hard, you can often rig a hose or a bucket and funnel to feed cooling water well enough for a short run up.
I wouldn't buy any boat, even a new one from a top-name yard, without a sea trial being a condition of the sale. You just never know what will turn up.