You will also need a Raspberry Pi 19 and a GSM transmit module to impersonate the old-timey cell towers they used to use. You can purchase one for about $3 or so and run this script...
After you have hand built a new battery that fits it, built a LCD shim to connect to whatever the latest standard is, etc.
Older cars are simpler, both in total, as in the requirements to retrofit replacement parts. Your average machine shop/etc will be able to keep that 914 running for the next hundred years. And when they stop selling gas, you can convert it to run on everclear.