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I would just use the 1mfd. It is close enough. Run capacitors jump in 2.5 and 5mfd increments, so they can't be that touchy. I think it is more important that you use something made as a run capacitor. Besides capacitance and voltage, they have to be able to deal with a certain amperage, too.

Can't you just cut down the large SS funnel to fit the Behmore drum?