You answered your own question. There is different wattages depending on what is used. I just looked in my manual. It doesn't say. You might need a owners manual to find the number and today's wattage is probably different than they were in 65.
The closest thing I found is in my 74 electrical parts manual, I ran that part number online and got 53/63.
My reason for asking is that last night, I swapped out my Jeep’s factory 7 inch headlight housings and bulbs to the KC daylighter 7inch headlight housings and they converted my bulbs to H4 55/65 bulbs. My field of vision increase 3Xs. They’re brighter but the pattern is better and projects farther. And they’re not LEDs so they look factory. Only 150 bucks
So with the amp hours and watts being nearly identical I was thinking that kit might be a good upgrade for the dart
