Slant 6 Distributor 3874598 Help

I purchased a distributor at a swap meet a couple of months ago and was wondering if anyone could decode this a little more. I was thinking that this was a genuine Mopar OEM slant 6 and not an after-market. It seems like a quality unit with a heavy tan cap. It looks a little dirty, but they're is no evidence that it was ever bolted down. The plate on the side is # 3874598 tried looking it up, but all I get is a bunch of ads. Any help would be greatly appreciated.

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