if you get the rust under control and the engine is serviced regularly you won;t have too many issues. like you say very little to go wrong on them.
also it might be worth looking at some of the conversion kits, you can bring the brakes up to modern standards by converting from drum to disc, makes the car alot safer. think there are also some suspension strut upgrades as well.
underside and boot area need a good rust check and or clean and seal.
am really impressed with how nice that looks. i think the soft tops are nicer.