Those are ignition points.(you have 2 sets there)
unless you have a late 70s LBC, or someone has converted it to electronic ignition, if you remove the distributor cap you will see one of those setting just below the rotor. Along with a silver "can" with a wire. (that's the condenser).
There are four "lobes" or raised parts on the shaft in the middle of the distributor, that, as they turn cause those points to open and close. Thats how you got timed spark before solid state ignition.
Nope, never seen 'em before /ubbthreads/images/graemlins/grin.gif