Hello all, new to your forum. I have a 1974 Buick Estate wagon with a 455 in it. It is all original with the only change being dual exhaust. The car has the original carb that has been rebuilt from a very reputable guy where I live. It has new plugs, wires, distributor. I have been fighting with a very mild ruff idle and it just does not run as well as it should. I found #7 and #2 cylinders not firing. I pulled all the plugs(Bosch Platinums and 6 of them are nice and brown and seem to be running about perfect. #2 and #7 are almost brand new looking with no color and the platinum is still bright white. I did a compression test on all 8 cylinders and all have 150psi. I then pulled the valve covers to verify the rocker arms were intact and push rods there. All four valves are traveling as they should. I am thinking that those two cylinders are running lean but I am at a loss. I am thinking that maybe I have a vacuum leak but it idles decent beside the minor ruffness. Has anyone ever ran into this issue?