Let me suggest some items,
1. Firing order correct?
2. Did it run this way before the changeout of carb & HEI?
3. Was the intake manifold changed?
If manifold was not changed, we could, maybe, rule out the intake gasket, but still a possibility.
Its one side of the engine. Could swap the pre-Edel carb and see if its running improves. If it does, then the mating of the carb to intake needs addressing, or the carb itself needs adjustment or its faulty for some reason. If it doesn't, then swap HEI, but I don't think it would be an HEI. Don't forget the ground wire on the coil.
Also, something about the dist cap, I learned from members here, CRS has taken over my mind, (can't remember squat). But with it being 1, 3 & 7, every other cylinder on the firing order. Something about the dist cap.......
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