mechanical advance
I think any of them that were marked are on the bottom of the weight assembly:
http://image.moparmusclemagazine.co..._electronic_ignition_system+advance_plate.jpg
Bear in mind, IE this example of 15, those are DISTRIBUTOR degrees so this is a very lllloooonnnngggg advance, 30* at the crank.
Easiest way is with a light, either degree your balancer, buy correct size timing tape, or borrow a "dial up" timing light.