Of course a "low pressure" electric unit could be used on that car & the manual pump blocked off.
Many older cars(ie;MG or Jag) used an electric pump with carburetors.
I would think that 50 pounds would be a fair price.
MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)