When was the last time you saw one of these (mystery race engine purchase)

In most typical bracket cars the 590 cam was a better option than the 620…….especially if the engine isn’t “high compression”.
The one engine I tested that used one was like 13:1.
I plotted out the cam, it was 283@.050.

With flat tops in a std stroke 440 and EZ-1 heads, I’d expect it to be kinda soft in the mid-range.
It’s fairly easy on parts though.

The only 590 vs 620 comparison I remember seeing:
It’s in a stroker SB-

https://www.hughesengines.com/Upload/TechArticles/Fading_Color_Article.pdf