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I agree with danno. It is just a big contactor- essentially another starter solenoid in front of your old starter solenoid. Whenever you want power to the car you have to power-up this contactor. So lets say you want to sit and listen to the radio- this thing will be on also, helping to drag the battery down. Any idea what the coil amps are? Use a switch to connect the line from the distributor to the coil to chassis. For the car to run this line must have pulsing DC (the points opening and closing) but if your switch connects it directly to chassis it can't pulse and the coil won't build up a magnetic field and fire.

You probably need to ask on a Cougar forum. I just work on wires; I don't have access to the various cars to give you an answer as to where things go. That said, you should talk to my wife: she tells me where to go all the time...and it is usually only one place...