Main reason I went with the LED is the 1.5 amp draw instead of the 5-8 amp draw of sealed beams.
I have EFI, an electric fuel pump and dual electric fans on the radiator, so my main concern was not putting too much strain on the antique wiring.
When I had my dart in for the makeover, I had the entire electric system revamped with a trunk mounted battery setup with 2-gauge welding cable that Cracked Back made for me.
I ripped out the old wiring and replaced it with an American Autowire 26 circuit harness which almost everything runs off relays now.
I still am running the truklites though because they are BRIGHT and I like how they look... lol