Outside storage for 3-5 years....

If one was to store/save a project that won't be gotten to for 3-5 years, and does not have the inside space to store it because of 2 other projects in the works..... How would you do it and try to not have it waste away?

It would be in a concrete driveway. I'm thinking up on blocks about 36 inches off the ground to allow airflow underneath would be good for the bottom side, but what about the top side? Drain the fuel and make sure the coolant is adequate (or drain that as well?). Double a large tarp to make 2 layers and tie it down tight?

I'm having 2nd and 3rd thoughts about selling the Shelby Dakota since the wife asked me if I was sure about it. I'd really like to keep it for my 10 yr old to learn to drive in like his big brother Jacob did, but I don't have the inside space unless I get rid of one of the ragtops and that really isn't an option at this time. If I do keep it for Joshua, I figure in 4 years it will be time to tear it down for a refurb.

Thoughts?