Hold your hand over the throat of the carburetor and see if there's good suction. If there's not much suction means you have low intake manifold vacuum. Check your manifold to make sure its not leaking. Spray some starter fluid around where it mates to the engine while a helper makes an attempt to start the engine.
If it still doesn't fire I would check the compression and compare the readings. If you have low compression I pull all the plugs and pour engine oil on top of all the pistons. Then crank the engine over a few times. Reinstall the plugs and see if it will start. Worn rings, sleeves and valves not seating can cause low compression. Hal
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