The S24 is the predecessor to the newer S23. They are very good boats with good accommodation and sea keeping see here for proof https://www.youtube.com/watch?v=L4URrxp-kJw .
Yep S24 / S23 / S25 in that order. Didn't put V8 in, mostly Volvo Diesel with the occasional 4.3. Later S25's had the Volvo D3 engine, but it has had some issues with the variable vane in the turbo sticking if the engine has never reached full power.