magnetic wand for osilascope machine-for timeing/settings goes in the u-shape on the timing tab(on my 78 440)and use the other lines/marks,the balencer can have #s and lines with crankshaft * increments,and may very well have something to do with valve lash

the are not stamped very deep in the damper either

most times they are painted over and you dont notice them,seen them on a lot of SB dampers

usally only one full line is cut across the damper to mark 0*TDC

you can referance the throw on the crank by the keyway in the end of crank with damper off,same with cam and doing a t-chain