Or put them in Plastic bags and liberally coat the inside of bag and heads w/wd-40. Seal up tight. Then don't forget to keep rechecking them every so often and respray if ness.
I would not use WD-40, it contains water. Any type for light oil should work. Sorry Doug, not trying to put you down or anything, but I'm not a big fan of WD-40 and not to many people know it contains water. I use LPS
1967 Firebird: 326ci, Holley 670cfm street avenger, RPM intake, Headmann headers, HEI