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Agreed, cars of that era had abysmal headlights. A lot had to do with antiquated USA DOT regulations, which finally relinquished and allowed better ("European") headlight designs; unfortunately the change came after your (and my) model years.
Since the 1970s (if not the 1960's, if I can remember back then) I've always substituted Cibie e-codes in place of the sealed beams. But after the days of sealed beams, when I got my 1993 240, their headlights were likewise abysmal and I spent a LOT of money to get Euroheadlights (both the relatively cheaper DJAuto brand for one car, and then the better Cibie/Volvo brand for my other '93 240) as the only solution for these cars. I am not familiar with 700 cars, but I believe that you're in the same situation -- you have to buy a set of European headlights.
I'd also advise not trying to remedy your problem with your OEM headlights by just putting in a brighter (or different color) bulb. The problem is not wattage -- the problem is where the photons are directed by the reflector (the main factor) and front lens (lesser factor), as dictated by the requirements of the US DOT at that time of manufacture. A higher wattage bulb will just cause more glare to other drivers without helping your vision. Remember, it's where the photons are sent, not how many there are -- e-codes and euroheadlights have great performance with stock 55/60W bulbs.
One other thought -- you may be able to solve your problem with, alternatively, good quality (Cibie or Hella) driving or fog lights. Something to think about, especially after you see the prices for new euroheadlights.
Good luck.
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