Put a few drops of fuel in each cylinder via the spark plug holes. Open the throttle wide and st art flipping. If it does not rfire and run out t5he charge when your arm gets sore its an ignition problem.(you said it had good compression).
If it fires and runs out the charge you have a fuel problem. If fuel runs out the carb while choking your carb jets are plugged. If it were a crankcase seal problem or bad reeds you would not get fuel to come up while choking.

An easy way to check your rings is to trot down to the local auto store and get a compression checker.If you run big engines its a nice tool to have