Call me the next time you have a shop session- - - -I'll talk you through how to get it installed and timed correctly. That gear on the bottom meshes with an identical gear on the camshaft, so any one of the teeth can engage. That gets the point cam and rotor out of synch with the cylinders and camshaft. You can fix a "180 out" situation by simply swapping spark plug wires in the cap- - - -no need to remove the distributor from the engine. I'm a lot more concerned with making sure the distributor housing drops all the way into the block and engages the oil pump drive.

A lunch break isn't long enough to install and time a distributor correctly by a phone conversation. I can do it in 5 minutes, but I installed my first one in 1962!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!