With my current setup would this be ok. I am looking for 440's and doing the hack but I am worried about pushing that much pressure on a stock motor. Your input would be great, pros and cons.

 

I would be worried too with a hack at 10-12psi. I would consider lower on stock internals just to play it safe. People have done it and can do it, but how long does it last. Stay low on you stock motor I know a guy that blew his motor at 7psi.