Engine shaking "a lot" could be from - (In no particular order)
Vacuum leak
Bad spark plugs - spark plug cables - dist cap & rotor - dist condenser
Incorrect ignition setting
Carb idle mixture not set correctly
Leaking head gasket
Burned valve(s)
Broken piston rings
Likely there could be other things and my brain is fried at the moment.
Diagnosing the cause will take some tools. Or you can start throwing parts at it and make adjustments as a guess.
Best tool you can get for older cars with no electronic diagnosis is a vacuum gauge.
Vac Visual: Quick Guide to Vacuum Gauge Readings - OnAllCylinders
vacumm-reading-1.png (2592×3528) (onallcylinders.com)
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