I have a 68 Fastback with a 428 CJ that sat for 33 years, and have been working on starting it. Drained and flushed gas tank, rebuilt carb, new battery and starter solenoid, plugs, changed oil, hand-cranked engine, etc. It cranks fine and starts to run while cranking but when I release the key to the run position, it dies. I had lost the ignition key and replaced it with a lock I had a key for. I'm thinking it may be a faulty ignition switch, but after sitting that long, it could be anything. Any suggestions as to why it would light up during the cranking but die immediately after?