Hey Schlep! If it was bolted to a nailhead motor, it is probably a ST300.......Nice find but I dont need it right now.I was able to get together with Dr. Frankenbuick earlier this week and get his, and both transmissions are at the tranny shop as we speak.
However, if the price was right and shipping didnt kill the deal, I might be interested in yours too at some point - there are some numbers on the round cover of the passenger side of the trans, above the pan rail - could you list those here? There shold be an "NK" somewhere in the sequence..
Thanks!