So, absolutely no air leaks at intake gaskets or rubber isolators on airbox or base of carb?
Float levels are set correctly and all jets have been cleaned. Fuel delivery to the carb is good. Choke system appears to be working.
Have you pulled all the plugs, grounded them and watched to see that each one has good spark when you crank the engine? (Check ignition coil ohms if weak spark)
Have you done a dwell meter test on the points when cranking to see they are set correctly?
Take a look at where the Dizzy bolt is located on the lock down, does it look right or has it moved? Are the vacuum pod(s) on the dizzy hooked up? Can you feel the advance mechanism in the dizzy working (Rotate rotor and it snaps back)
Are the wires, cap and rotor in good shape.
Compression is ok as per your earlier statements.
Hmmm, you need spark, fuel and compression to run... Something is missing.
If everything checks out I'd try minor adjustments to my timing in the advanced direction. It's what I had to do with mine when I redid my head studs last fall.