The best headlight upgrade for the money is Cibie 7" H4's. They're plug and play, no wiring mods needed and they're the same wattage as sealed beams so they won't overload the stock wiring. A relay harness is a great upgrade though. The lenses are fluted so the look very similar to sealed beams so they look right at home on an old truck. They're around $95 shipped on Amazon.
https://www.amazon.com/Cibie-082440-.../dp/B008DQV88Q
Low beam/high beam shots.
Lens pattern:
