Fuel lines
Yea it is the line that went to the charcoal canister I always thought that was called a return line.
It may or may not be iun that situation. Prob not. Prob is the fuel tank's vent to the recovery can. '72 has charcoal canister already? They work but unlike the earlier vapor saver when the internal foam filters break down and the charcoal breaks down those bits can (and do) make their way into the carb bowl. :(
First. Figure out the venting system you want to use for this car.
Second. Figure out the maximum fuel demand this car will ever see. Then decide the line size.
5/16 will do for most and exposes the least amount of fuel to the heat of the road and headers.
3/8 will have a little less resistance which will help with mechanical pump and for higher demand.
The plated steel will last a long time.
The stainless steel will slow heat transfer.
I'd buy a premade line and the larger clips if you decide on 3/8.
A lot of tight bends and getting that right requires some experience in bending tubes. Otherwise you'll waste a bunch of material.
Also for the hoses to really seal best should have a bubble or ridge. That's not a common tool.
If you find its just one section of the line that's bad, there's nothing wrong with using compression fittings to splice in a new section. Not to be trusted on high pressure and hydraulic lines, but fine for mechanical and low pressure fuel lines.
