I'd go for a vacuum leak. Hoses, hoses clamped, brake booster nrv, carb isolating plate cracked etc.
But first check timing is correct. Set at 1500rpm with advance hose blocked off.
Check valve clearances.
Check vacuum leaks.
Check oil in dashpot. I use 80/90 gearoil.
Replace carb diaphragm.
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One day I will get rid of all of the rust.
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