you could just drill a 1/4 hole in one transfer port cover put a small square omc pump on a plate (also drill 1/4 inch in line with the pump ‘s rear pulse port .
Before you do all this choose the best port so the pump will not interfeer with the cowl.
the carb should be ok as is.
see OMC mod in picture adjust the plate to match the transfert port cover ….. mount the pump, plate and transfer port with longer bolts .
you may need to resurface the transfert port cover over flat sand paper surface doing figure 8s to make it 100% flat under the new aluminum plate .
attach the pump from the under side of the new plate.
you can off-set the pump so bolt heads will fit in the transfer port cavity just make certain the pulses will reach the pump’s rear port…. apply sealant on the transfert port rim to prevent leaks under the plate
hook up the pump to a new side fuel connector or directly to the fuel tank. hook up the fuel outlet to the carb
all that said and done.. purists will disagree modifying your antique ob
jmho..
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