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Once the engine is bolted to the motor mounts and the headers are in place, bolt the tranny to the back of the block. Then, from under the car, bolt the big-block's flexplate to the torque converter. Both the bellhousing and the flexplate use the same bolt pattern as the small-block, so that's no big deal. If you're running a manual tranny, you'll need to swap the 502's stock 12-inch flexplate for GM's 14-inch flywheel (PN 14096987).