Smith.lee is right about not chasing the perfect seal on an old truck. These engines have been through so much that a little weep is part of their character. I've seen guys replace a gasket only to have another leak pop up right next to it. You end up spending hours and money for no real gain if it's not dripping. On something that old, you have to pick your battles based on what actually affects how it runs. It's better to just keep an eye on it and only fix the stuff that really matters.

Magnetic strips in the truck bed work wonders, ever thought of that?