Andy,

Get off the bike, smoke some Camels or Lucky Strikes, take a shot or two, and then sing this. Just kidding..but I do agree that a raspy sounding singer would sound good on this.

Overall, it does have kind of a classic rock style. I had a thought that maybe a bit of a Southern style guitar bent might also kick it up a notch; something like The Black Crowes type sound..with some keys, perhaps.