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Don’t worry about the tap scoring in the brass sleeve. 65 and 63 PSI is not great but should run OK but with less than ideal slow idle speed. 70 -75 PSI is ideal. Sounds like the one way valve and or it’s screen may be your problem. Or the line up to the idle mixture orifice may be plugged. Watch the small hole on the front of the crankcase while pushing down on the primer. You should see fuel spray out of the hole when you push the primer. If not, get that one way valve out and clean it and the line. Impact driver or large blade screwdriver should get it off. More good info at pochefamily.org/outboard or call me and I will walk you through it. If the spray is good when you push the primer, then you have some other problem like compression or ignition.