Palettes and Hex Editoring

[Snap006]

I read some. How do you know if your rom is headered or not?

I need 9 battle palettes.

These were the ones I was looking at changing to battle palettes:

Index = 137 Palette Index = 13 Description = Some cloud looking thing
Index = 144 Palette Index = 19 Description = Looks like a rock
Index = 82 Palette Index = 17 Description = Chest
Palette Index = 30 Description = Doesn't look like it is used for anything
Palette Index = 31 Description = Same as 30
Palette Index = 27 Description = Same as 30

Those are just some off hand. BTW I got those numbers from FF3usME.

Do you know the best one's to use that will least affect the game graphically?
Thanks, for responding.