Has it been sitting a long time? It could be that the valves (or springs) are stuck or worn out. I am not that familiar with Packards, but used to work on ford flatheads. It is pretty easy to pull the heads on them to see what is going on in there.
51`s were positive ground and 6 volts. count the battery caps. if there is 3 caps its 6volts, if there is 6 caps its 12 volts. sometimes if its not original someone may have converted it 12 volts.
Power out? Check your alternator fuse. In fact, check all your fuses.
If no injector pulse, swap out the crank angle sensor.
Use the link system to check the datalog for unual readings suggesting a ECU fault.
If it won't crank, consider installing a push button starter --seriously.
Problem with sunroof or turn signals, check relays.
If you repost, expand on "powering out."
GVR-4 - 91 Galant VR4 electrical issues ' DSMtuners.com
You used a word that Fixya scripts didn't like and redacted. Is this a three wheel gadget for carrying golf clubs and begins with C and ends in Y and has a couple of Ds in it? They are often made by Golf Town and they supply parts. They are also available on Amazon.
