When this hack
came out in the 2000's in the old Acmlm's Board, it came with a palette files to use only for this hack. So here's a comparison...
Before the custom palette.
After the custom palette.
The custom palette does make the hack look better, I'm pressed for time to take more snapshots atm. You can get the NVC.pal file here,
that link will only last 30 days, if someone has some time on their hands to upload the pal file with the hack, that'll be cool. I'd do it but I gotta head out. Enjoy the hack with it's custom palette.