We're going to use the ground. Both engines will be attached to a drive train and wheels which will contact the Earth. The static friction at these contact points will not be overcome by the torque (lack thereof) of the engines. (The static friction will certainly be overcome at times by over-baking corners or driving into the weeds.) As the car moves the engines will go as fast as the Earth allows. Get it?
This weekend's progress was minor. Did a few more stripping tasks and got everything ready to haul the MR2 down next week to start cutting it.