all depends on cost , rarity of parts and all
but …. if I was stuck I would see if the holes line up on the base plate …keep the base gasket parts 42 and 23 and mount a newer square pump over it
alternative cut a aluminum plate to reseal the bypass cover … or get a bypass cover with a different pump mounting structure (holes) to mount a OMC square pump over it
if you do the plate option drill a center hole in the new plate for vacum pulsing, line up with the pump base gasket and
mount the pump 2 2 bolt holes drilled in the plate to mount the pump.
I know folks don’t always like cheapy pump but I have used them with success
omc square pump are $20 on eBay
up to you…. if pump capacity is a concern you can alwayss mount a round MiIkuni with a new pulse line connected to the bypass cover (drill and tap add a NPT… NTP ? 90 degree adapter for the hose
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