Depends on where you live when it comes to storing your car. You don't have to worry about humidity in the Southwest. And most areas of the country are pretty dry in the Winter. Just be careful that you don't pull a car dripping with road salt and grime in beside your Cobra. That stuff will migrate across the floor and get up into your prize where it will eat away. I had that happened to my '66 Mustang where it did some major corrosion while I existed in Michigan.
As for your engine, Avblend works great in the crankcase. Used for aircraft, it's pricey, but what's the value of your engine? The stuff is amazing. Ok'd by the FAA, it's not snakeoil. Z-max is the repackage version of it for the automotive industry. Even AJ Foyt uses it in his Indy Car engines. And there's the stuff that's been around for years . . . Marvel Mystery
Oil. The stuff is great considering the price. Use it in the
oil and top end.
The best solution is to do what John Wyer did to his stored GT-40's . . . vacuum bag them and seal the engine and transmission. Not too practical for us peasants.