I have a question...im sorry to cut in but i have no clue how to post on this forum. I have a 1978 Ford F250 with a 351 and a Motorcraft 2150 carb. Runs nice but here on top of a mountain, at 19 degrees (or less. Brr Arctic evil weather) it won't start. The choke is closed so much that absolutely no air can get in. Where would u usually set a choke in order to start this puppy at altitude and freezing cold? He's been very unhappy lately 😕