I'll start with most of the used 86 svo headlights I've seen are horribly yellow to brown. To me it looks like they have been burned on the inside from the 9004 bulbs generating alot of heat. I also know most people wish they put out more light as well. This got me thinking about LED lights. They don't put out any heat that I know of. And after doing some reading it seams like the LED headlights on the market only make heat at the base where the circuit is. So this begs the question would a set of LMR LED kits for the 87-93 cars be worth a try? The only problem I can see is that kit uses 9007 bulbs. Would an adaptor work, or could you just repin them?
https://lmr.com/item/LRS-9004LED/Mus...Bulb-Set-87-93