The foil on engine lids always seems to rip above the distributor. People mentioned this was due to the spark plug wires not having angled boots. The straight wires, therefore, contact the engine lid. Over time the contact rips the foil.
While at my storage unit yesterday I found a Bosch spark plug wire purchased from Bill and Steve's years ago. It had the angled boots. I searched for the part number on the Internet and it turns out they are available at Amazon.com for $16. If you order two sets the shipping is free!