I double checked with liberty gear where I bought my T56; apparently it's an early version for a GM swap out and require the adapter plate. Sorry I don't think that I can use it as the transmission is not set up for it
Just to help out, this is about the simplest way to run an LS-style T56 with internal slave behind a first generation small block. Or big block too I guess. Sure it's a bit of initial cost, but you don't have the added expense of a pull-type clutch that was used in the LT-style T56.