I run DRIVEN oils in my old cars. DRIVEN is / was Joe Gibbs oil. I think they were bought out by Comp Cams a few years ago? Anyway, DRIVEN offers different weights and formulations (conventional and full synthetic) with the ZDDP additive that protects flat tappet cams. Plus, they meet MIL specs for storage to help guard against rust, acid formation, etc. You can order from their website, drivenracingoil.com, or you can see if it's available through your local auto parts store. I know Summit sells it. DRIVEN also has gear oils, break-in oils, ATF, assembly lube, etc. It's good stuff!

If anyone wants to order direct, I got to know the US sales guy for DRIVEN a few years ago and I can put you in touch with him. He is a former Car Chief for NASCAR teams including Tony Stewart during one of his 3 championship seasons and Jeff Burton. He knows his oils!