i agree the 645 will do the job, but as far as the motor i think you should read the threads about this motor here on the giants.there are now a couple of manufactures that are making this size motor,some better than others. before you make your choice do a search. you can find most of the answeres here on this great site, if you do a search. almost any question you have about giant scale and gas motors and rc in general. welcome and good luck in your quest
