I don't believe "BRC" cranks were Bryant cranks.

I seem to recall they were an outfit in Tn(Tennessee Engine Works), and at least for a period of time they were using forgings that were supposedly of European origin...... German I think.

They were supposed to be "good" cranks, but I had a customer that bought a 511 that had one in it, and from a journal fit and finish standpoint...... It really wasn't very good.
I shared shop space with another full service shop for a while, and the guy who did the crank grinding wasn't impressed at all with it.

It was 4.250 stroke with Mopar journals and I had it stroked to 4.375 with BBC journals, and built a 542 out of it.
572-13 heads, made about 830hp.
After a couple seasons it came back for freshening..... The crank was loaded with cracks.
We replaced it with an Eagle.

Ive never seen any .020 under race bearings for Mopars from FM or Clevite, but perhaps King has something.