Here in Colorado there is an old drag racing team by the name of Kenz & Lesile. They held the land speed record in the mid fifties with a mil ti engine flat head powered streamliner. There mostly known for there cammer powered Cougar, car number 777. Ron Lesile still has about 5 or 6 cammers still in crates. When they retired from racing they started a distributor ship selling BG oil and fuel additives one that is fantastic for the older flat tappet engines is there BG MOA oil additive, I own an auto shop and put it in every oil change. It brings the lubricity up on any oil, including the synthetics. I have a 66 Mustang with a pretty healthy 351W with a solid cam and have had zero issues. Just my 2 cents. Clint