I have left my 73 outside for over 23 years I lay down a good tarp or plastic sheet, install a good car cover that is not plastic or vinyl. I fill the tank to the top and add staybil and if you don't run the car I do during the winter put a battery minder on it Sears had a good one on sale for $20. Leaving the tank empty promotes corrosion same with the block anti freeze it up and disconnect the battery if not using a tender or it will be dead if it goes below 0 and you have a constant draw. Also not driving it promotes flat spotted tires Decent day run it around the block if you can do it