[waypastcrazy]

5.Remove the 2 screws holding the breaker plate in place and remove the the plate.

6.Now you can look to see what your advance cam is set on.It will be labeled with the letter L and a number on both ends.The end that is mounted over the stop tang is the one that is the advance.The one on the opposite end is a different number and if it is what you need you can flip the arm over and position it on the stop tang.

EXAMPLE
8L = 16 degrees advance
10L = 20
12L =24
13L = 26
14L = 28
15L = 30
15L = 32
18L = 36

7.The centrifugal advance will be the number on the arm multiplied by 2.
EXAMPLE 8L would be 16 degrees of centrifugal advance.
Add that to what your base is going to be and see if it totals to be what you want total timing.if not change it accordingly. Local parts store should carry an advance curve kit.I have found that earlier dura sparks as in pre 76 usually have the size advance arms i need but you can weld the slot to make it not advance as far or bend the stop tang on the ones that have to much.widen the slots that do not have enough advance.I have measured them and aproximately 1 mm = 3 degrees of timing.
IF the opposite end has closer to the number you need just flip the arm over to that side.