Sharon's explanation is the one and it's big block Dodge. This song could be my dad's life. He's gone now, so I can tell it. He ran whiskey to upper East Tenn. from Knoxville in the 1980s (dry counties in Ky. & no liquor in our part of Tn.). That's after he built and raced Mopars for years.
Shot a coat of primer (like with a spray gun) was enough to cover the sheriff logo like somebody said. The car was for practical purposes -- outrunnin' the law. And cars don't run on moonshine. I'm not a musician but the lyrics/diction, choice of bagpipes and ghostly echo embody such a life. I cannot hear it without weeping.