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This is the kit you would use to rebuild your old pump as oil mixed in pump where new kit injects into fuel line like newer engines. Many engines damaged due to wrong kit installed as pump has to have the holes in diaphragm to mix
I use Mystik JT-4 from O'Reilly's in all my customers. Right up there with OEM oils.
https://www.oreillyauto.com/detail/c/jt-4/mystik-jt-4-1-quart-marine-gear-oil/mys1/jt4gearlube
It has a X flow crankcase...looking at carbs, the ones on left feed pistons on the right (2/4/6) and vice versa. Check the throttle plates as cylinder 5/6 can be off due to being single plates