1987 OMC Cobra 2.3L overheating

[Bruce K]

Hi, I have a 1987 Chris Craft with a OMC Cobra 2.3L, I have replaced the impeller and the thermostat and upper and lower exhaust hoses and riser gasket...but am still overheating quickly at cruising speed...HELP....I am new to boating and boat repairs,,

 

[makomark]

what did the exhaust elbow look like?

 

[Droid]

Fresh or salt water boat?