Isn't there also a potential issue with plastic fuel lines that needs to be considered ?
https://agilitypr.news/Classic-Car-owners-still-don’t-understan-7618
Hence the use of Valvemaster Plus, it's not just about protecting valve seats. I did replace the fuel lines on the Renault 4CV and the Bonneville as a precaution too. A trivially easy job so nothing to panic about.
