Back in the early days of owning my '69 I had to find winter storage for it(had to give garage back to mom). It spent a few winters out in the corner of the backyard.

Cleaned it up, backed it into position over top of very large piece of plastic(used to get 30x40ft sheets). Jack it up and put it up on ciderblocks(let tires hang) and cover with cloth truck cover. Take plastic and pull it up tight over top of truck and take another sheet and drop over top and tuck under tires. LOTS of rope and bungee cords kept it all tight. A large piece of plywood over bed kept the snow from collapsing that area.

Did this for like 3 winters? Finally had enough money to buy storage garage for winter months after that. Couple years later I bought my own house and it wasn't a problem then.

One winter I left it outside and forgot to unhook the battery!! Come spring it fired up with no problems! Never really change antifreeze or used stuff like Stabil either.