The name rings a distant bell as a boatbuilder, but not as a builder of GPs.
I am presuming the boat is a Series 1 aka Mk1 wooden hull?
Why do you ask the question? If you are after a soundly built boat a visit to see it should tell you all you need to know. The “mass produced” 60s and 70s hulls tended to suffer from cheap ply, steel screws and iffy glue. They were not resin coated and certainly not intended to last 40-50 years when built! The fact that many do is testament to the craftsmanship of the time – only the better ones survive outside.
My point is that if you go and look at it all of those problems will be immediately apparent if the boat has them, and if the boat is in good order if you maintain it well chances are it will stay that way.
Will it be fast? That is another question! I suspect if it was a priority you would be looking for a Series 2 boat.