Super Moderator
How long are you storing it for? Under what conditions (weather, exposure)? Does it have modern radial tires on it? (if it has bias-ply drag slicks, my answer will be different)
Registered User
My parents have an 89 Vette with 8000 miles on it. Never been stored on jack stands. I see no problem with leaving it on the ground. After a year or two, you'll notice the tires are a little lumpy when you first drive it. But after a few miles they'll be back to round again. After that, it's as if it was never stored.