I wouldnt use a pump that powerful.
1.....it would be complete overkill as Cathar stated in his own terms.........Erosion....Id have used the term EXPLOSION!
2.....What the h&ll are you gonna seal it with that will hold that kind of pressure??
3....WTF do you think the effect will be on your block with that amount of pressure ???.......
Even if your block will withstand that amount.......I dont think your "jet" holes in your "shower head"will last that long!
4..Where would you possibly put a pump of that size?
Youre going to connect this thing to your PC?..........
Why dont you just donate those system components to someone before they get destroyed in your experiment?
5....Are you serious????????