www.rallylights.com

IF your stock wiring is known to be in good shape AND you are using relays, you don't need to do much upgrading in my experience. I've used Hella H4 E-code conversion headlamps on my '77 B-200, '77 Aspen wagon, '90 Astro and '83 Toyota 4x4 pickup with no issues.

I've found the 55/60W versions offer plenty of light, too, and Suquehanna (see link above) has a great description of why E-code (Europoean light pattern) lenses are superior to U.S. DOT lenses, which I agree with.