Dan, there is nothing wrong with running front runners on the front and rear at the salt, they are race tires. Just make sure that they will handle the total weight of your car. They are made to disapate heat properly and not roll off the rim if you get sideways. I surely wouldn't want to run them on a paved surface on the rear, especially if they got loose and smoked a little. There was a problem with bikes using the dragster front runners on the rear of their race bikes.
Steve old fart