The 210 El Nikkor works with 8x10. Covers fine on small prints (810 and 1114). The ring that holds it to the lensboard must be filed on 2 sides so that it can be fitted into the lens stage. Not a big deal.
I didn't like the way the enlarger bobbed around with the 810 conversion, so I've added some wall support. Seems fine now. Some people add counter-balance to help the motor and existing counter-balance a bit.