HELP!! What SB Valve Covers do I have?

My buddy knew I wanted stock valve covers and hooked these up for free, which is appreciated, but they don't look anything like the stock-style valve covers I have seen seen on clean 318 and 340 cars at shows and whatnot, which is the look I envision for my car.

I think I can make these work, I just need some info if some folks can help:

1. What engine and year do these appear to be from?
2. On the valve cover on the right, is that 2" tall tube a breather? Or what?
3. Is there a factory cap (or something) I can put on that 2" tube?

I tried searching here and google images, but no valve covers I saw look close to these.

If the paint is any indicator, I will say it bappears to be original, so 71-earlier? Was there any small blocks that were red after 73 maybe?

I plan on cleaning, re-painting/restoring these, I just need some help so they will look right.

Thanks, and sorry about the crummy phone pics.