Agreeing with mtb .....
I suspect you have valves stuck open, valves leaking, or valves opening at the wrong time, either would prevent any pressure or vacuum building up at all.
If valves were staying closed, there would still be some 'breathing' of the cylinders, and you would have seen some slight movement when you had the carbs covered with plastic wrap.
Any chance the cams got mixed up? This would make the valve timing totally off and prevent compression/vacuum.
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