hello again,
haven't had the time to fix this issue but now need to take another crack at it.
1979 300D - vacuum pump blows oil into intake. can I swap with later model pump? local pic-n-pull has a couple of the single port pumps or should i just rebuild the original and avoid incompatibility possibilities?

thanks

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'79 300D "Jaeger"
'61 VW Baja "Frosch"
'92 Honda Shadow 600
'80 Honda 185 (cafe project)