I am having a tough time finding a 180 with a protruding horn from the intake manifold; there should be just two gaskets and an insulator. Can you provide the model code, i.e., fj180v-cm03, please? Remove the intake tube so you have some room to work or simply remove the air filter housing intact. I would replace all the gaskets, as they are rough but may still work okay, as the inner sides close to the carb bore are intact. Once the air filter tube is removed, you should be able to angle the carb easier to get first the choke linkage, then the throttle linkage and spring hooked up. That breather tube is rough, and I recommend replacement to prevent ingestion, being that it comes in after the filter. Please get back to us with the full model number. Thanks