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I went out to try and set the timing on my truck today, and I could not find the timeing marks on the crank. (67' 352) Then I got to looking at it, and I don't see a harmonic balancer on my crank. Isn't there supposed to be one for these engines?
It looks like you have the balancer with the sheave cut into it directly.
This was common.
John is right; a little sandpaper and a dab of white paint or "whiteout" wiped over the nothces will reveal them.