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I have an Alltrax controller in my electric car and I really like it, but alltrax makes low voltage high amperage speed controllers, their highest voltage controller is 72v and 200 amps costing about $450 on Ebay for their 300 amp two minute rating, (200amp 5 minute, 125 amp 1 hour) speed controller, granted their specs say the 72v controller can handle up to 90v but my 48v speed controller says it can handle up to 60v and if I pull the charger off and try to drive I have to wait till my 48v pack rests for a few minutes and the voltage drops down to 56.4v before the controller will power up due to over voltage protection, so I suspect that the same will hold true for the 72v speed controller, that it would never turn on if you had say a 84v pack.
So if you want to try running a 110/120v motor at only 72v you might still get almost 1hp out of it and you are going to have a much better quality speed controller that is made in the USA, but if you want to get the max speed and power out of your motor that is possible you are going to need to be able to run it at 120v, your other option of course would be something like the Open ReVolt speed controller, 144v max and 500amps, but that would be a speed controller on a bicycle that is powerful enough to work on your car.
Testing your motor on a 12v and 24v battery pack without a speed controller, like I said is going to give you a better idea of what you can expect from that motor at lower voltages, you might find that it has plenty of power or you might find that at 12v you can stop it by grabbing the motor shaft.
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