I asked this question, and it looks as if there isn't a good drop in solution.
https://www.oilburners.net/threads/ford-headlights-stink-what-to-do.83754/
It might be possible to bolt in the old sealed beam headlight buckets and get better lights that way, but I haven't had time to dig on that option.
Another option, as folks here have said already, is to put in relays and buy new headlight assemblies. That at least gets you back to slightly better than new. The relay mod is worth doing in any event, because it keeps your headlight switch/connector from melting down.
There is one set of semi-custom projector lights which are a drop in, but they cost nearly $800. See my thread for the link.
Right now, for quick and cheap, I think I'm going to put in the relay mod, new stock headlight assemblies and Phillips xtreme vision bulbs, and buy some ebay KC driving lights for the open road. That will see me through this winter, and hopefully I can come up with something better that doesn't involve driving lights for next winter.
I advise against the LED drop ins, because they have terrible glare and are ******* oncoming traffic, even on low beam. They are bright, but even on low beam you're going to have people flashing their high beams at you. I have a pair, and I'm not happy with them for that reason. I have a pair of HID drop ins, and I suspect that they are going to have the same glare problem. Now that it's getting dark again, I'll give them a try.