What relays have you added?

I have added 4 relays to this 72. Two for the headlights, one under the hood to provide 12 volts switched ignition for the hei distributor and one behind the instrument cluster in the car to power the autometer dash / stereo / shift light etc...

Typical Bosch relay part number 0 332 019 150 for example. I order them off eBay for about $7 each.

Terminal 30: main power feed
Terminal 85: ground
Terminal 86: switch
Terminal 87: NO output
Terminal 87A: NC output (center pin)

When you apply 12 volts to terminal 86 the coil energizes and you have a direct path from terminal 30/87 via the relay contacts. When you disconnect the 12 volt signal from 86, terminal 87A will then be connected to terminal 30.