I have done a search, but there is a LOT written about this car. I'm trying to find some facts about how many times the engine has been rebuilt and exactly what has been replaced on the engine or machining done. Was the engine converted to run unleadded? Were cam and lifters replaced? I understand that Castrol products have been used since new. What OCI? What filters? Has the reduced ZDDP in modern oils been an issue in this old flat lifter engine? Thanks.