I got this car for when i was 16, been in moms garage for the last 25 years. It needs a lot of body work, but ran when i parked it. I was told it was a sprint and that there was not a lot of them made, it is a 3 speed straight 6 with the factory hood scoop with the turn signals. So what makes it a sprint? body, motor, add ons? how can i verify this and how rare are they?