If you didn't swap cams, you can easily drop your distributor back in by lowering it into place and aligning the rotor with the mark you made. If you installed a cam as we did or the engine was accidentally rotated, you will need to locate top dead center on the No. 1 cylinder. Rotate the engine until the timing pointer is at zero on the damper and both the intake and exhaust valves are closed on the compression stroke of cylinder No. 1. Install the distributor with the rotor pointing toward the No. 1 terminal, and you'll be set.