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My goodness – that’s a pretty rough looking L/U.
Editorial aside — you’ve checked the inputs and from your description, they seem alright. I may have missed some of detail above but what about the outputs ? I.e. are the exits from the port side water jacket plugged ? Is the powerhead base gasket interfering with the water exit from the powerhead?
With a salt water motor – if it’s never been descaled inside, there must be some level of corrosion in the jacket and passages.
If you have a laser thermometer, you can identify the hotspots in the block.
K
NB. Water spitting or not spitting out of the exhaust relief is not a good measure of waterflow. I have some motors where there is none.