I think you mean a 2.4 not a 2.3!!!
I don't think a bit of pitting in the sleeves of a chrome bore motor is actually a big problem. Burty's had it when we took the heads off many moons ago. Tighter heads went back on along with the dual stage reeds and cross drilled manifold from an XR2. It screamed round to 6800rpm for many outings after that and pushed his Sharp 19 to over 76mph before being sold on the boat. Wicked motor!!!!!
FYI the tighter heads came straight from a stock 2.0 150. Using these heads is a well known mod for the 2.4 200. Cheapest bang for the buck you'll get!!!