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I did just happen to be looking on Ebay just for pictures and found some later 70's blocks with the smaller pad, so maybe that's what it is.
Here is the clock. It also has 3917291 heads on it, which seem to be 68-69 heads.
Hi guys. New here, but have had this engine for probably 15 years. It is a 3970010 with the 10 dot clock right next to it on the rear flange, so...