Identifying missing pieces on eight engine.

I removed the rebuilt the engine almost 5 years ago now, and due to several unforeseen factors I'm just now able to get back to getting it back into service in the car. I took and saved a lot of pictures but it seems that some files have been lost and I am now on a completely different computer.
I am now needing some help in identifying some of the areas that I can't find pictures of and that seem to need attention.
Mine is the eight cylinder, '50 Commodore.
On the carburetor side (right) side, barely visible below the coil is a mysterious looking opening that looks like it needs some kind of a cover. I have a couple of photos, it shows up right under and to the left of the coil, and up close in the 2nd shot.
Any ideas?