Misfire at cruise, popping/afterfire at 3000RPM

Mattax said

I dunno George. Not seeing that looking at the plugs but ??


Nevermind. I found it it.
Why are my distributor cap terminals burnt?

if this is the curve that's in there now, its a little retarded to a lot retarded. That would make a sluggish response. Might also leave a fuel partially unburned -

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I would expect 24 total to cause a misfire. It also sounds like when he disconnected the rear carb, the car ran better - but still broke up.

I think you're right on the money with this being an ignition timing issue. It comes in late, and doesn't go far enough.