Vacuum line help

So I was taking off all lines that go to my 318 in preparation to take it out in favour of a 4 barrel 360, and as I was removing the vacuum line that goes from the carb to the little charcoal canister with the three nipples on the passenger side and the nipple cracked! Just age I guess, but is this system good to keep after the swap? I'm sure I can find a new canister from a junkyard or something.

And I know one line goes to the fuel tank but have no idea what the other line is for, anybody know?