There are other HEMI badge/decal options that are much nicer looking than the factory ones. Go to EBAY or AMAZON and simply search on "HEMI BADGE" or "HEMI DECAL".
I've found that flat decals last longer than 3D badges (especially from 3rd party vendors). Get a nice flat decal, in a color that compliments your car, and maybe add some Cubic Inch numbers, for a nice retro look.
The original badges are easy to remove with a little "Goo-Gone" and some fishing line or dental floss.