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if replacing the plugs, ensure they match the wires. Classic Benz wires have a "large" impedance and the plugs are the 0 resistance type. Current Bosch books say to use resistor plugs, but that's because the also recommend lower impedance wires to compensate. There's a spec for overall impedance from cap to plug tip.
Also, the plugs are ideally copper, not platinum. As the small tips on the platinum plug foul in those motors.
BTW, the fuel pump at the rear is rated for high volume, but low pressure. In that regard it's very different from today's pumps and it is subject to clogging from gunk in the tank. You might want to clamp the hose between the tank and the pump and then disconnect it from the pump to see if it's clogged up with rust and junk.
-CTH
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