From what I’ve seen, they sure look like the Brodix iron blocks.
No idea where they actually come from though.
They are supposed to be the same , Blueprint also , was a discussion on yellowbullet a couple months ago .
There must be a market for St/SST racers let alone bracket racers and even just street guys . Even a iron block with just cross bolted mains as a standard upgrade would be a good thing . Here in Oz a guy was advertising a stock 76 440 for nearly $4000 . Bare blocks are around $2000 .
Tex