I just bought a 95 maxum 2300 sc, i have 5.0l mercruiser alpha 1 gen 2, with a closed cooling system. i just had it serviced for pretty much everything impeller, new carb, etc..
she idles fine and cruises at about 2800 to 3000rpms at about 160 degrees, if i go above 3000rpms she starts to climb...