Yer digging in some very old Memory Alpha banks, old man…
I haven’t scraped a babbitted bearing since…1977?
That was then a local volunteer fire department had me rebuilt the Continental 6-banger engine and 3rd-member trans, on a 1923 Kelly-Springfield fire truck!
Similar to this, but chain drive/external band brakes, on the rears, only.
A real beast to drive!
Frankly, if the journals aren’t scored,they rarely are OOR.
I did a fair few shell swaps, on Jaguars, where the customer just “wanted to get by,” and they worked fine. Same with Datsuns.
On Formula Vees, it’s pretty standard to do a rod bearing change every couple of races, due to the high stresses on them, plus their in-built lack of positive cap location, and I never lost a rod bearing on them.
On some Vees, I could even do it with the engine in situ!