This is a Mk2 3.4 sedan, 1966. Will only run on full choke. When choke is deactivated, the engine quits running. The car has been idle for about a year. Gas level was low, so added some fresh gas.
I’d check that the floats are moving freely and not stuck.
Sounds like a vacuum leak. Brake booster?
If it’s been standing I’d strip the carb down and give it a good clean. The old petrol may have evaporated and gummed it up
You can check for vacuum leaks by spraying carburetor cleaner on suspected spots. If the engine changes RPM then you found a leak. Be sure to check all vacuum hoses.
Run BG44K at least once a year. Its not snake oil and is available on Ebay by the case for about $15 a can. It removes all sludge in mowers, scooters and cars. Keep it off of your hands and paintwork.
Easy to check, use a clamping pliers to block off the line to the booster.