To add onto what
@Big_John said.
Rubber hoses are usually ~$15 each. Replace all 3 of them. (although 66-68 Budd front hoses might be more)
There are NO NO NO places to use copper tubing with car fluids (except for perhaps some sensing lines on the AC?).
Copper will work-harden from automotive vibration and will crack/leak. Cannot risk that on fuel or brakes.
There is modern brake tubing that is copper-colored, (called cupric?), so make sure to get hte right stuff. Although auto parts stores generally don't sell copper tubing anyway.
But I've seen at least 1 person on the internet bragging about replacing all their tubing with copper from a home-goods store, so it's worth a mention.
As for your current tubing - you need to pop them out of the clips and inspect 360deg around them. Keep in mind that if the tube leaks anywhere, you lose all the brakes fed by it. If there's 1 weak area, the whole tube is generally junk. (yes, they can be cut/flared/repaired, but it's a PITA).
If there's any doubt on your tubing, I would recommend getting a kit from Fine Lines, Inline Tube, etc.
There's a certain satisfaction in knowing that *everything* is new and shouldn't need to be touched again for as long as you own the car.