If you have both bowls and metering blocks off, remove the screws that hold the base plate to the main body, and turn the main body so the choke horn is facing the front of the car. Or, IOW’s, you want the choke horn facing the left hand side if you are looking at the carb with the throttle linkage in front of you.
Then just bolt it back together.
So I removed the base plate and installed it 180 just want to make sure it’s on the right way before I finish putting it back together