327c.i. Sbc running rough, advice needed

[Bullett]

Starting to get really discouraged now. Bought a new (good quality) distributor cap and installed, it didn't help. #2 cylinder still isn't working. The exhaust manifold on that particular cyl. Is far colder than the rest. I then swapped plug wires with another cylinder and #2 cyl. Still didn't work. I am starting to think the worse now. Bj383's theory is my next route. What else could it be. Could a bad rotor button possibly do this? Bad distributor? If I had a broken piston ring, I wouldn't think I would get the 150 psi cyl. Pressure, which is the same as #4 cyl. If it turns out to be something internal, I'm not going to go there, I will just keep my eyes open for a different motor altogether. Preferably one with HEI ignition and 4 barrel carb.