The 904 is a tough lil sucker. I am sure at some point we will both break the input shaft though.
Your motor probably makes more power than mine. I'm prob running 725+ hp through mine when I add in the 200 hit of Juice. After I get my ladder bar project all done I will find out first hand how much power is capable with a 904. More juice will be on the menu for sure.
I have a built 727 done and ready with billet Drum etc when it happens that I will install. It seems that everything I am doing is not supposed to be capable & you too! Lol