I've seen cam bearings spin in stock blocks and had no issues reinstalling another set of new stock cam bearings and having the motor live a long and happy life after getting problem fixed that made that cam bearing spin, not enough clearance to the cam journals
All the replacement cam bearings I've seen and used are mainly all Babbit, which is very soft so as long as you remove the excess Babbit stuck to the block so the new bearing installs correctly, round and enough clearances to the cam journals
IHTHS