If you've been reading this BrickBoard list regularly, you'll see that one of the most common discussions (along with the AW70 OD relays) has been about improving headlighting on '86-on cars. All of us '86-on owners ENVY you! We have to either make long term fabrication projects, or spend big bucks on imported Euroheadlights.
Not you, you lucky dog -- you've got sealed beam headlights, and quads, at that! Wow! Just get a set of Cibie E-code H4 substitutes* for your 4 rectangular lamps, and you've got the second best headlighting possible, exceded only by quad rounds (because a round parabolic reflector is more efficient, but don't let this bother you). The cost is nominal (compared to us '86-on owners), and the effort is negligible.
[* I seriously recommend Dan Stern; his website is provided in one of the other responses; and I also recommend Cibie over other makes such as Hella -- a personal preference.]
I've been using Cibie headlights as replacements for sealed beams on all the cars I've owned since the early '70's -- until, unfortunately, I got my first '86-on 240 (a '93). I wouldn't drive anywhere without either those Cibie substitutes, or real Euroheadlights; and you won't either, once you try a set.
There are further steps to improve lighting, such as using relays and heavy parallel wiring to ensure maximum voltage to the headlights; and using higher-wattage bulbs, but by far the major step will be to switch to E-code headlights.
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