As the others have said, the carb can be removed and mounted 180° in order to facilitate connecting to your throttle linkage. There may or may not be another issue with the carb being so close to the firewall. Many have problems when mounting 4-stroke engines with the carb being so close to the firewall that they have troubles connecting the pushrod to the carb. To fix this run the pushrod past the carb and bend it back 180° and then connect it to the carb throttle linkage.

Ken