I run a basically stock 727 and I think I am making abou 600 flywheel hp and I use Mopar clutches and steels since I worked at a Dodge dealer for 24 years I have a few Mopar clutch plates and steels in my stock. And they hold up fine in my trans as this 727 has been in my car since 2006. I added a manual V/B and a bolt in sprag along with a Dynamic conveter. I look at it like yes the 904 is faster but for my street car where I am not out to set a record I prefer the tuffness of the 727. Ron