l-wood 240z

I have a 1972 240z with a L28 engine swap. When it was done the shop left some of the 240 parts on the 280 engine, distributor, dual stand-up carbs and the coil. I have a spare 280 that I am trying to swap some parts off of, here is my question. The ballast resistor that is necessary for the coil to work properly is wired up differently from 72 to 77. If I take the coil from the 280 to try and match up with my 240, how exactly do I wire in the resistor. Stock 240 resistor only has one wire coming out, stock 280 resistor has two wires and is wired in differently. Can you tell me how to properly wire in the resistor.