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You're going to want to check everything over just the same as anything else.
A car that has set for that long is generally going to be one that needs some level of restoration.
I highly suggest that the engine is not attempted to be turned over without checking fluids, changing the oil and putting some fogging oil down each cylinder and first turning engine a few times by hands to ensure lubrication.
Rust and corrosion will be things to also check for under the car.
A car of this type I would also be checking body for previous repairs of damage and that everything lines up.
Run engine casting number to make sure it matches.
Fuel might just need to be drained and changed, might need mild cleaning or may have caused major issues, you will want to open fuel system and inspect.
A car sitting that long will also generally have dry gaskets/seals that once started and used will form leaks.
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