sounds like you have a few separate issues that are compounding into a real mess.
firstly that new carb .. it's most likely the jetting is incorrect, hence the smoke and rough running. The aftermarket carbs are intended for scooters and are not setup correctly for buggy's. If you have the original carb, your in luck. take the jets, main and pilot and install in the new. If not buy a 115 main and a 35 pilot jet. that will fix the carb.
The hose routing is questionable... like "x" noticed. that T in the vacuum line is wrong. There should be ONE hose only running from a nipple on the side of the intake to the top of the carb.
There should be a hose connected to the drivers side top corner of the valve cover. It is open to air. It is a vent breather. it should not be connected to anything. make sure it is free flowing. IF so that's where that extreme crankcase pressure is coming from.
The hose on the bottom of the carb is just a bowl drain hose. it can be removed completely if you wish.
fuel line runs from tank through a inline filter to a nipple on the drivers side of carb. No vacuum petcocks were used on the yerfs
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