It's a simple weight/spring change in the governor, maybe a 15 minute job, no fluid loss doing it either. I raised my shift point from 4500 to 5000 with my Lunati Voodoo flat tappet cam, gained quite a bit in 0-60 and 1/4 mile times. I'll probably go up even higher with my new setup.
I hadn't realized it was that easy. 5k is as high as I'd want to go anyways though.