Wiper motor question

I now have a 3 speed wiper motor, 72 dart, and I was wondering if I would get any more room by my distributor if I went to a 2 speed motor on used on 73 or later dart. I have a 5.9 magnum and have a GM all in one type distributor installed. It fits but very tight. Another question, do later wiper motors require that resistor.