how much horsepower can the 904 take?

TCS Products in Langely BC sells the 24 spring return module combined with a billet steel or alum drum { get the steel one for street use } as a package that when coupled with their deluxe race rebuild kit { Red frictions ,Kevlar front band etc...}and a good valve body makes a 904 that they run in their 1400hp Pro comp Eliminator car ,if you make more power than that then you should probably go in a different direction .