It, not they, is indeed on the balancer. The mark is a 1/4" wide notch cut into the back edge of the balancer outer rim. It doesen't go across the entire balancer rim. Very hard to see. The leading edge of the notch is 5 BTDC, the trailing edge is TDC. Reccomended timing is 5 BTDC.
Once you find the mark fill it with white or yellow paint.........Bob
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Bob Beck
39 Chev PU
69 big block Corvette
55 Buick 66C
57 Buick 46C
55 Olds S-88
56 Chrysler St. Regis
AACA, BCA, WPC, USHGA