360 won't idle smooth...can't figure why

I had a similar thing after the first few months of the 360 being in my Barracuda. It would idle ruff but run OK down the road. Could pull of plug wires and there would be no change in rpm and my compression on all cylinders was/is 195 +/- 5 psi.

It turned out to be the ignition wires. My daughter had given me a set of the cheap yellow wires that only had the carbon loaded conductor (no wire over wrap). They even measured in spec with an ohm meter. In despiration I swapped to a set Moroso Blue Max spiral core wires I had and low and behold the rough idle smoothed right out.