Has to be a "Simple Cyclone" by Nigel Beale (could be about 40 years ago!)
(Not this club but the racing club -HCGB)
Engine looks less old!
In my humble opinion very unsuited for open (unprotected) water as these were only for "racing"
when supported by recovery craft, and 25 mph was fast, -- now its nearer 75mph, so wouldn't be popular on the start grid!, and the noise will be very LOUD-----
It will sure get noticed, but not in a particularly good way. Sorry
As you have bought it, there isn't much we can say now without sounding "A little unkind"
We are the Cruising club- HCCUK