When is a 904 too small?

I am wanting to say that the Bucky Hess/Herb McCandless type 904 drums in the heavily modified 727 case for the Hemi/BB bell are good for upwards of 800 plus horsepower wit the the 6 thin clutch discs. Of course the center support in the case helps control the already mentioned end play and wobble problems inherent in the 904 design so the realistic figures for a 904 drag trans is around 750 HP on a fully built trans brake unit is around 750 HP for a season on a set of clutches and seals. It seems like A&A's Rick Allison does a modified A500 front pump kit but it's been a while since I've looked at the site. Definitely worthwhile to get Tom Hands book on Torqueflite transmissions.