"Yeah" I Know everyone probably gets tired of me saying it "But" Monoblocking can only be done when building New bbls, or Re-tubing a set of original monoblock bbls.
One "Cannot Monoblock" a set of "Original" Fox bbls, they were brazed together, not built from a single block.
I just like to keep terminology as "Pure" as possible.
Thus, in assembling breech loading bbls we have such terms as; conventional lump, dovetail lump, shoe lump, chopper lump/demi block, dovetail chopper lump, monoblock, etc all referring to "Different" original methods of assembly.
Re-tubing, most often called, sleeving, can be done to any of them.