I follow Nardo's advice with most collectibles. but my GT gets the extra treatment of being driven and enjoyed.
long term storage - Run and driven once or twice per year. Battery charge as needed or once or twice per year. Extra air pressure. Tires get square for sure after 8 years or so of sitting.
I have a storage building that just kills batteries.
Running them frequently makes all the difference. And heated storage is required.
I can't fathom what it takes in a humid climate like Florida for storage of old cars. Mucho electric and AC for sure.