[Salvatore]

first picture looks like a 283 or 327 balancer. 67 Z's were small journal cranks. Pretty much a 283 crank was used for the 67 Z/28's. 68's and 69's were large journal cranks but all Z/28's 67 thru 69 took the wide 8" balancer. 1969 was the first year for the offset timing mark though.