Our small block stuff is all 904 case/shafts. Our big block stuff for class is 727 case with 727 input/ shafts/converter and 904 internals (pricey). Bracket big block stuff is 904 with adaptor(not class legal) with 904 convertor and shafts. Confusing enough?
ps Raining like crazy at my place 20mi. as crows fly from track!