Need some help! 2 Questions??

[bowtieride]

How do i get the wiper arms off? Started sanding down the body today, and cant figure how out how to get them off. There is also a tube coming out from the bottom of my carb, I think its a vacuum line or something to do with emissions. Its a 250 motor. If your facing the truck from the front its on the right side at the bottom of the carb. I dont know what to hook it up to, but i know its making my engine run rough, because if i put my finger over it while the motor is running it changes the sound of the motor. Not sure what its doing, but i would like to get it hooked up. Thanks for any help!