Least expensive way to bright headlights?

As some of you know, bought my Hurst for $1000 in 2003 sitting over 10yrs in a junkyard and have been slowly restoring it ever since. Front headlights don't look too dim looking at them, but if I'm on a street without street lights, then its difficult to see the road. When I turn on the highbeam, they work, but no difference in brightness. My alternator's output is good, battery is good. I think the old wiring might be the problem or maybe the switch is corroded since water dripped down...

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