Mopar Radio Improvement
You can add a booster but the radio is always going to be an early 70's radio. Even after a friend restored my stock 72 AM/FM it still sounds like 70's technology. I like the install RetroSound did on CCR Duster, here's some pics:
http://www.forabodiesonly.com/mopar/showpost.php?p=1584053&postcount=164
Here's RetroSound's site:
http://www.retrosoundusa.com/
More expensive option but RetroSound will be able to set you up with the same install as the Duster and it will sound great and offer many more options. It even has the "original" look IMO.