I had a 1967 233 with twin 2.5 litre for many years repower it with 3.0 litre then sold it to a friend who also re powered again with later model 135 hp 3.0 liters.
tremendous boat one of the best 23 footers around!!!!!!!!!!!!!!!
But this time he did most of the restoration I still ended up painting it with Imron and this boat still rivals all boats of its size.Just go to google under [ Formula 233 ] and check out the third image [ Chadrows Formula 233 Sport Fish ]