On the pile of old stuff I have torn down that bearings had a plausible date code as being OE, they all had a stylized "FM" logo on the backside.

Just a guess, I always assumed the OE supplier was Federal Mogul, but might be off base on that.

Take the cap off a stock rod, and you'll see mating surface has a groove machined into it. Originally the rod bearing had a notch that matched up to that groove, the idea oil would squirt out in semi-controlled fashion.

Just my humble opinion the biggest benefit of the squirter notch might have been for long periods of hot idling
(Like a police car/speed trap for hours on end) to attempt to shoot oil at the cam, lifters, wrist pins, and so on.
As rpm goes up, I believe the more rod side clearance is more than enough to do the same job.

I could be wrong on all this but in the past spent alot of time wondering why things might have been done
as they were. Somebody in the past thought it was a good enough idea.

It was just an interesting little detail they used to have.

Those NOS bearings are cool. I would want to use them, but maybe they would look better on a shelf somewhere.