you are sure you didnt switch the wires? did you touch the distributer at all?

when you said the engine does not stall when you unplug the last 2 cylinders, does the vibration increase at all, or idle drop any? Cause it may be getting spark even if it doesnt stall even though the other cylinders do, but im not sure of the firing order.

I would make double sure you did not mix up the wires. And if they are correct, can you confidently say that you are 100% sure it is not related to the previous problems?