years ago I replaced my 1960 lights with Hella 7" bulbs. Thousands of miles driving at night with no problem. I changed the H4 style bulb from Halogen to Zeon to something new, I forget what they call it but It's bright. On high beam I can see the top of the trees.
You need to check your wire size for the higher amp drawn. And check to see if you have a relay on the lighting circuit to take the amp load off your light switch. I have a relay on both the high and low beam. I had to put one on the low beam last summer because I burn up another light switch on the way back from the London Cobra Show. Driving in the day with my lights on for 11 hours.
I run my lights all the time. I know it's a yellow car but I don't want anyone to say they could not see me!
I also installed the 1157 LED in my brake light and turn signal. You may have to change your flasher to one of the new electronic units to get the bulbs to blink. I had to leave the old 1157 in the front to get my rear signals to blink.
When I changed mine years ago I had to match the red LED to my red lens and yellow to yellow lens. LED technology may have changed that.
A little trouble but well worth the time and cost.
See ya on the road
Dwight
http://www.summitracing.com/parts/hla-002395071