I'm not sure about your 350 but on my 400, the choke is on the left side of the carb. I THINK I could reach a
manual knob but not sure. I bought a Chinese knock off carb from Amazon for mine. My stock carb was completely seized. It's working surprisingly good. Carb was like $30. I just opened it up and matched jetting.
Later today ill snoop around and see if I can find a carb for yours.
Mad