Classic over carburetion problem?

TT5.9mag said

@Bret Tschacher good post. I agree with it except the part that a “timing light will not tell you”. You can use a timing light to verify rotor/cap terminal alignment (phasing). Take a used old cap and drill a big hole in it adjacent to the number one tower. Shoot the timing light at it with the engine running and you will see where the rotor is firing. FYI MSD makes an adjustable rotor for their distributors and it’s worth it’s weight in gold when phasing is out.

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Yes that would work aside from the issue I never did a destructive test like that. However the timing light would never tell you the voltage drops across various parts of the system. When I did have access to the dyno and CRT scope I could pinpoint problems from ignition failure to carb issue without having to drill holes or shoot lights, I could do a printout or simply look at the display screen and know exactly what was happening. It was also much easier than crawling around over the top of a running engine especially with a rear mounted Distributor.