Again this misses what is understood as living, 900hp to the tires for how long , would you put that same motor in a baha car, or super speedway car, or outlaw car or boat and expect to finish??
Are you going to make the same claim Mercury does with there 1400hp motor ??? or there turbo motor ??
ANYTHING can do it for a short period, you aren't running at 900hp all day, and most shops aren't going to build something for someone that may try and do such a thing and then it comes apart without saying this isn't the best option for this build...
Would you put your factory block at that hp and leave it there and see how long it stays together.
You can hit factory blocks with 400 and 600 hits, but guess how long that lasts ? it doesn't last forever and you can find out within one short day if you do it enough..
So again having 900hp on for a few seconds is not the same as putting that in a outlaw car and maybe completing 5 laps.
Now whats wrong in telling a customer this won't handle 600hp reliably ?
Again have you seen what some people do with things when you tell them something will handle it?