If you can get the starter installed, it will be fine and will rertract once the engine fires. You can also retract the drive, put it back on the starter, and hold the teeth against a spinning wire wheel on a bench grinder. Spin it in the direction that makes a ratcheting sound, not trying to turn the starter motor. If you get enough speed on the drive, it will retract. The starter will be easier to install with the drive retracted.
Your rockers and pushrods should re-install fine, and standard adjustment procedures will work.
John - "The Hoosier Hurricane"
