As I recall, the flexplate bolts to the crankshaft only one way. It must be flipped the right way and rotated to the correct bolt hole. Similarly, the flexplate and torque converter align only at 1 bolt position. Pre-assemble them and mark with paint, otherwise, when you get under the car you will have to try up to 4 positions before you get the torque converter attached. When you bolt flexplate to the crank, you need some way to prevent the crank from rotating. Of course, use a torque wrench for all bolts and follow the manual.