Do a search here for MME. There was a spat detailed here a while ago over an engine they built. Though that seemed to be a valve train geometry issue (and perhaps customer service issue, read to decide for yourself). I don't remember what block was used.
I too might be in the market for an aftermarket block, but the TMeyer offerings always seem 3 months away, and like you I can't find anything concrete on other options - disappeared websites, aged info on websites, info split between social media and websites, and ghosts of projects past.