If you mount the motor all the way to the right side of the the motor plate ( pull cord side) then you will put the sprocket to the outside of the motor and clutch.
If you mount the motor more to the middle or left side of the mounting plate then you can reverse the clutch with the sprocket to the inside of the clutch away from your leg.
Make sure your clutch/ sprocket has a hex nut to tighten to the shaft after you have it aligned to the rear sprocket.
You will find the Briggs forums here have a lot of helpful people as well.