Thanks for all the comments!
To avoid confusion, I'm the current, not the original owner. Can see from my original wording that's a little unclear, so I've edited the initial post to clarify - it's a former race car that I've owned for ~8 years.
Car is being restored (glaciers may move faster though
)
Yes the car ran a nominal 302ci, not sure why the original owner felt the need for accuracy to 2 decimal places! The tube on the hood was likely for a tach, Jon Mello suggested the tube is like those seen on 60's era drag boats; I've never seen one on a race car before now.