I have the paints/coatings sitting in front of me:

POR-15 Rust Preventive - Semi-Gloss Black (2 USA quarts)
BEHR ULTRA (mixed at Home Depot) - Exterior Satin - Black (2 cans - 29 fluid ounces per can)

I will use two coats of each on all 6 sides of the pine bed boards (1954 3104 1/2 ton standard-short-bed Chevrolet pickup).

Unopened cans of each - Home Depot will machine-shake all of them when I am ready to paint.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.