Just replace the jaws with soft jaws been there done it on a 4" Pratt 21 yrs ago and two current Bisons.
Wont matter much with 4 jaw people rarely use them so stands a good chance they will be ok.
3 jaw really iffy and certainly cannot tell whether any good or not until it goes on your machine. Jaws open up tapered, visually look ok but will have runout.
Had a Bison/Tos 5 1/4" on my scrapped ML7, relegated to RT 14 years ago.