Thank you for all the replies. One thing I should mention is that the pump is off the engine and I'll need to get a new gasket for the impeller cover before I put it on again- the gasket was in rough shape and there was probably a bad seal.
There's plenty of water coming in through the raw water intake. I ran the hose water very lightly, so not a lot came out when I ran the engine with that, but there is approximately 0 coming out with raw water.
A few months ago i resealed the muffler inlet, and now there is a lot more water than there used to be in there. So I'll try to check for clogs there.
I disconnected the hose from the thermostat to the manifold and blew canned air each way. Lots of air to where the water pump connects and less through the manifold.
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