If anyone has any hints/ideas, feel free to leave them below! For now, I think I'll be on the lookout for a 169-pin 486 Overdrive. There's one on eBay as of today and I may pick it up after I get paid, if there's any spending money leftover. :)

Things I've learned since then: There's two different 486OD processors, one is 168 pins (for when you have a CPU to remove) and the other is 169 pins, the extra pin (which my socket has!) is for disabling the existing permanent processor. There's also a 486 POD - Pentium Overdrive - that I can stick in there, but they're even more expensive these days and have a fan. I don't have an on-board fan connector so I'd have to adapt a molex to get that running correctly... And that's probably overkill for what I want to use this old thing for.
Mostly I want to get Retro City Rampage running which has a 486 version but unfortunately it requires the math coprocessor.

I'm wondering about my "new" RAM modules... they might be parity and this board might not support that.

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