Like I wrote in another thread, the 2 cars I'm looking at are 6 hours drive away, it would be tough go go there walk in make an offer and walk away if the deal is too high and also tough buying one without really trying them out in the snow if that's even possible.
I would say to wait until the spring then. No one in their right mind will take a car out in the snow with summer-only tires, let alone an expensive Corvette.
If you were coming to us, the test drive would be a hard "no." 95% of C7 Corvettes we have sold didn't need a test drive, both new and used.