It's surprising that the car runs at all if the carbon brush and spring is missing! I've had a car running on just the spring and that left a charred mess. The spark goes from the coil to the plugs via the carbon brush and rotor so any breaks in the path will give you problems, The new cap should hopefully cure that.
You've got the info on the pump. Make sure you use the correct size sealing ring and that the recess in the head is cleaned out. A little silicone grease on the pipe O rings helps. If it leaks around the pump seals after fitting, undo the bolts about half a turn and put a suitable length of wood between the pulley and a trolley jack tucked under the front of the car. Jack up until it starts to push the car up a little. The holes in the pump are a little bit bigger than the bolts so the pump can move up a bit and this helps to compress the seal.
Can't help you with the Strombergs. It's explained in the Haynes, as is the pump replacement.
Mechanically challenged maybe, but reading?
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