216 question

[1955 Eddie]

So I've gotten around to getting my 216 running. Things were good. Easy start, nice idle, no smoke And revved up fine.

Over the past week it developed a slight miss at idle and started to blue smoke At start up and all rpm ranges. Started to go through things and found that while the truck is running I can pull the spark plug wire off of the two back cylinders and no change in the way the truck idles or revs.

I have no experience with these 216s and don't know the overall history of the block. I replaced the cap, rotor, wires, plugs, etc before starting it. Easy fix? Need a rebuild?
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