Take a piece of soft fuel line that will fit snugly over the vent tube sticking up in the front of your carb squirters and route it back towards the rear of the carbs so if any fuel sloshes up into the fuel bowl vent it won't spray or spew into the carb.
Your probably okay with those stock white vent tubes on the metering blocks though
You need jet extensions in the rear
Are you spraying the NOS?