Listen to this noise...

Nylon distributor gear strikes again??
Hmm mark distributor and block then pull cap and mark rotor to body and remove...
Inspect gear, post pics.

I lost a couple teeth at a time, but never had that sound... it would just start idling like **** and even die...then you would pull the cap and the rotor FREELY moved a lot .

The mechanical advance allows 'some' movement..but you feel spring resistance