Diagnosing Distributor - No Spark Chase

^^That's ok but you need something to tighten them TO. Unrelated, it never hurts to improve block--to-body--to battery grounding. The block is usually pretty well connected to the battery through the main cable. What I like is to buy a short "starter" cable (eyelet to eylet a bout a foot--foot and a half long) and bolt to one of the rear holes on the driver side head, and then to the firewall with either a good bolt and nut (and star washers) or bolt to the master cylinder mounting stud.