With all four wheels on the ground, you unhook the dogbones. This allows the engine to move some. Then push the car a little. The force from the front wheels will push the engine back and forth. Just push the car until the engine tilts forward. Then set the e-brake so the car will stay in the exact same spot. As long as all four wheels are on the ground with the e-brake set, the engine will stay in the same spot.