@S1Pitts Oh, hey, that’s a pretty good idea. So to be super clear, you taped right into the block and just removed the PCM blue drain hose? Got a photo of the setup by any chance? I know some older boats didn’t have the blue drain hoses and you just had brass plugs you removed every winter, so perhaps that is your setup?
Also, update to my comment above, I found an image in the PCM owners manual that shows the outlet is aft and the return is forward (closest to the belts at the front of the engine).