Most of the movies Elvis made for director Norman Taurog of MGM from '65-'68 have little to recommend them and this is a prime example / offender.
Elvis plays a NASCAR driver with unpaid taxes and Nancy Sinatra is his IRS watchdog / love interest. There is a big race coming up. No points for guessing the rest. Yawn. There is a decent song and dance number set in the waiting room at the IRS building (really!!) and some very good racing action. NASCAR stars such as Buddy Baker and Richard Petty did the driving and it looks very real, at least until we see Elvis in close up in front of an obvious rear projection screen. Man, I hate those things.
Elvis and Nancy have about 5% of the on-screen chemistry Elvis and Ann- Margret had in Viva Las Vegas and the songs are about 5% as good. Watch that one instead. It's even about racing, too, but road racing rather than NASCAR, so I guess this one is supposed to be different... Not awful, really, but about as formulaic, derivative and forgettable as Elvis' movie output ever got.