I will get some of the spray-on copper coat. Never used it, but it sounds like it's easier to use.

I transferred the valve train over to the new head, and discovered a bad hydraulic lifter/tappet. It's beat up some where it contacts the valve. Is there a better brand than another to replace it with? Is it recommended to replace them all if one goes bad? I'm looking to save a little $ here unless it's a bad idea.
Thanks