I have an early 8-3/4, need info on

Ended up with this thing at an auction, looks very freshly rebuilt, and apparently shortened, bracketry and such definitely don't look stock, axle tubes cut and smaller dia one's welded in.
I have never worked on a splined 8-3/4 so I dunno if these are stock or have been changed out for possibly a circle track car or something.
It's only ID is a cast in number on the passenger side of the, pumpkin housing, barely readable. I couldn't make out the 2nd digit, tried a couple of possibilities and figured out it's '57-64.
That number is 1634985.
Definitely looks like an 8-3/4 anyway from the back.
Front loader. Marked in orange junkyard marker near the fill plug, "4.10". Appears to be an open rear.
Has what I call a Ford style yoke, shiny new looking, gold anodized, "spicer" stamping as plain as day.
What would it fit?
I went to an auction today at a closing, 80 year old ford dealer, I had heard they sold our, built auction was listed as a "surplus" sale not "closing" or "retirement".
I wasn't thinking about it other than wondering what it might fit as I walked past it a few times, sold towards the end of the sale, caught my attn because the auctioneer called it off as a "Chrysler " rear end.
I bid once and nobody bid against me..... I'm gonna TRY to post pix, you guys all know how tough that is for me to do....

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