Re: 383 started up possible carb problem
MSD boxes either work or don't work. Your's is working.
Use a vacuum gauge to intake vacuum and adjust for highest reading, both in fuel mixture screws, from Skeeter's suggestion of 1.5 turns out, a good starting point, and initial timing, advance it, CCW on the body.
Next, look down the air horn of the carb to ensure there is no fuel dribbling from the venturi booster. If there is, remove the carb top, easy to do on an Eddy, lower the fuel level.
Since the plugs are blackened, you might need to change them, unless you can get some road miles on them to clean them up.
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