They are scored.----Motor has to come apart !!-----Reed valves have nothing to do with this issue either.-----Looks like some metal bits were bouncing around in the top cylinder too.----Take this motor apart now.----Keep running it and all hope for repair is gone.
That impeller / pump housing was used on the bigger outboards from about 1964 to the late 1980's ----And on the stern drives as well.----Shame on any shop that does not have that item in stock.----Or knows how common this item is !