To get a little more technical, you need to confirm that the needle and seat will pop off and then re-seat.

On the regulator or metering valve side of the carb, the gasket goes against the carb body and the metering valve diaphragm goes on top of the gasket and then the steel cover with the vent hole.

On the pump side of the carb the diaphragm with the little check valve flaps goes against the carb body and the the gasket is on top and then the cover.