Identify this converter

Back then I could tell when seeing someone looking for a parking spot and they went by me, when they had a factory hi stall in their car. . They were "whinier" when crawling at those speeds in 1st gear. Seemed especially so in F M J body cars ...Ive had a couple of them over the years.

But I just bought a fresh 904 l/u converter from someone here, the number on that one is a "CR9L" for " low stall, I looked at a cr9h in a catalog and hi stall is only a couple of hundred rpm more than the CR9L. Both have a 400 rpm "rnge" in stall, and they actually overlap.
One is like a 1700-2100 and the other is like 1900-2300. So either could stall out at say 2000 rpm. Listing showed this as either of these being for a 225 or a 318.
I'm debating on switching tranny's in my truck an 85 D150 with a slant. Currently a 727 (which may just stay put unless/until I have a problem with) I was hoping this was the hi stall because of the weight of a truck, but discovered exactly what it ia once the big brown truck got it here. It'll work for my needs ...

I have on hand everything I'd need to swap in an 833 OD but I also have an a500 here and I know exactly where there's a 60s /6 with a sb 727 old enough to have that plate adapter needed to put a sb trans behind the/6. I got this "CR9L" to complete the swap that way if that's how I decided to go.
( Got a fresh converter because if I go a500 it won't be without a rebuild and beef up)