my 64 Lincoln runs out of gas after driving 5 miles i add gas and its full with 4gallons.

sounds like you fuel pickup tube in the tank has broken off

Either the fuel pickup tube or the tank has developed a vacuum somehow. Check to see if air rushes in when you open the tank cap. Listen closely for sucking, hissing noises. You may have to do it right away after it dies or the air will leak in slowly and allow it to pump again.

There might be a Corvette-like bladder inside the tank has collapsed.the pickup tube broken off might make sense. Crawl under there and bang on the tank. Is it full?

Have someone check out your fuel pump(s) sounds like they are clogged. Easy to replace, though