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I attached a rubber hose to copper end and notched it on sides to accept the water through the channels and it sat flush on the water channels. Still no water pumping anywhere up on the block. The plastic groomer that is on the tube is not able to make a good seal so I used rubber braided high temp hose. It’s definitely a 53 lower unit without any water tube opening on pump housing. I did find that the impeller key pin spun below the impeller yesterday and I replaced with a bigger pin today. I noticed that the flat impeller plate became concave downwards after running motor. Not sure if that’s normal either.
Still open to suggestions to move forward.
Thanks for the advice.