Stop in for a cup of coffee

Looks like its for checking the angle of the driveshaft to the universals. Should be a bubble level with it?
Service manual shows how to do it. But diagrams no photos if I remember correctly.

Welcome to the club. I’m in the exact same boat. There’s a real solid 64 Polara 500, 318/PB727, project car that runs and drives, 2 door. For sale near me. I’ve driven by it for 3 months now with the for sale sign starring at me. I keep forcing myself not to call the number to inquire.
Chris - that 65 Satellite with the poly 318 at the Frostbite is for sale. It looks good down to at least 10', and you can drive it. How cool would that be? I've got more photosand a contact if you're interested. Guy's planning to swap engines out this winter if it doesn't sell 'cause he wants more power... Shame IMO.

He also has a bunch of these to bad they are lean burn or I would be all over them.
mopar 4091018 distributor duel pick up 4091017 on part | eBay
Did you see the pics I posted of the 400 cid lean burn Magnum?
Ray - Did you see the moparts thread where the guy is asking about original lead for a points distributor? I assume you scan moparts now and then.