We run a 410 smallblock(.040 360) and a 904.She makes about 2 to 3 hundred passes a year in her Dart and has been racing since 1989 so it gets abused. We broke a few front 7260 ujoints and it took the sprag out of the trans everytime. I had inland empire build me an aluminum shaft in 1998 with 1350s and thier billet slip yoke and it has been great.
I got my inputshaft from Marv Ripes at A-1 converters.