For anyone wanting to do the upgrade on their 65-70 B. No rotors included, but correct ones can be found here. Or as an alternative, use 69 drum hubs with 69-82 Corvette rotors.

Crappy pictures, but the thing that stand out most to me here is the hens teeth splash guards. They look new, or replated. They cannot be found reproduced, and are very rare nos.

https://www.kijiji.ca/v-other-auto-parts-and-accessories/muskoka/chevy-b-body-disc-brakes-1965-to-1970/1485704971