Help to ID very Strange 426 Wedge Block

Chrysler had racer support at the dealer that predates Direct Connection and Mopar Performance programs. Surely there must be a parts book from "back in the day" to be had that mentions this block. Some of you im sure have a Nascar max wedge single four intake that was available that way??? Wonder what parts book those are in??
I would also wonder if this block is considered a max wedge warrantee block of sorts?? 1/2" oil pickup tapping or 3/8"???