318 parts I.D. help

Hello all

I started tear down in my 318 to install my new intake and carb. But I have encountered a couple things that I have no idea what they are and if they are a problem.

First is this sensor that had no wire connected to it. It's on the back side of the engine next to the distributor hole


Other is a hole that was plugged, on the upper side of the head with the cresent moon paper above it.


Thanks!