Maybe you could try to heat it up a little with a heat gun or something to make it a little more "workable". I don't know if that's the best option, but may be worth a shot if nothing else works.
ive got it connected i took the carb and hooked the intake boot up first then pulled it to the motor and it didnt move when i put it in the groove so we are good
glad you got it on. i ran into this problem too so i took the dremel to the six bolt holes in the plastic and made them into slots to slide the plastic forward enough for an easier connection