well i looked and something is definatly "SCREWY"
the trans....its a 400 modulator location but it has a th 350 pan ...that happens to be completely reversed what it is suppose to be???
so i suppose its an auto? being i dont see no molded in shift linkage or linkage of any kind!?
and i used an LMC Truck catalog for the ref!
http://www.lmctruck.com/icatalog/cc/full.aspx?Page=8