I knew the fan motor app. was different, thought it might help clarify the motor lead questions.
Can't you put it on a switch with a resistor like the original motors? They were only single speed too, weren't they?

"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."

1957 GMC 150