Classic/Antique Car Repair: 235 chevy six, manifold gaskets, vacuum leak

Question
I have changed the dist. points plugs,plug wires,coil & carb and 2,5,6 cylinders are'nt firing i can pull all three plug wires off the dist. cap & it's only running on 1,3,4 cylinders oh,and i changed the dist.cap also please help :)

Answer
It sound like it might be intake manifold gaskets leaking. Take a spray can of carburetor cleaner and with the engine running spray the intake to cylinder head meeting pints. If the engine speed changes when you then you have found a vacuum leak. let me know what happens when you do this and we will go from there.
Brad