So today took the boat out for the first time. And it ran great until I got to the far side of Elsinore and the water temp went up to about 220 so stopped and waited for it to cool down.  So i started going again the temp went back down to 160 and next thing I knew the motor cut out and smoke pumping out of the carb and the oil breather so after we got towed back in by a scjb member didn't get his name but thank you if you see this  but I pulled a hose off the exhaust manifold and there was no water in there so I'm thinking the water pump but not sure
 

The gate valve was open none of the lines were pinched I also disconnected the hose from the gate valve and no water came out of there ether

if you have access to a garden hose, back flush to hose going to the pump.

Before you anything....pull the fitting out of the pump that feeds water to the motor..

I had a pump bearing fail, the shaft walked forward and ground the impeller into the suction housing packing the fitting with aluminum chips. 

The fitting off the pump is the bottleneck.