Reminds me of when I was a kid my step dad just bought a Plymouth duster with a slant 6 that had a stuck valve. He took a block of wood and a sledge hammer and straightened the valve while still in the head on the car. that car ran for years after that without any problems. If you remove the rocker arm and turn the motor over by hand will the push rod move up and down? Is the push rod bent? You may get luck and just have to fix the one valve.