https://www.ebay.com/itm/282715400118
https://realgaskets.com/product/valve-cover-gasket-44/
Follow the instruction sheet.

Valve covers are usually overtightened and warped.
I restraighten them flat and use a new (fresh, not NOS) cork gasket with no sealant.
Cork naturally weeps a small amount of oil but this is normal.


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."