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I had a similar problem with the pwr steering in my 68. I replaced everything yesterday. What a difference. Nice kit available from Zip Products. Comes with a rebuilt power steering pump, Ram, and control valve. I bought the new lines as well. Not too pricey after you get your core charge back. Once you get into it you will be glad you replaced everything. As it turned out my power steering pump was leaking and a couple of the lines were weeping. They were all original and 40 years old. The new parts should outlive me
You can replace a line [or lines]. But as long as you are under there, why not rebuild the pump and steering valve while you're at it. That would freshen the whole thing up and you know it would be in good working order. If it's old enough for lines to be leaking, it's probably nearing a rebuild anyway.
Mine also leaked for a while. I kept procrastinating and eventually blew a PS hose directly on to a HOT header. A lot of fire and scared the Cr** out of me. I had to clean up the fire extinguisher mess, power steering fluid, replace all of the plug wires rebuild the PS system and detail the entire engine bay. Could have BURNED to the ground. Take care of it right away, and be careful balancing the PS valve. Search for Jim Shay steering papers, a good guide. I'll try to find the link.
Please.. . A half assed way to fix it if it's seals and not a hose is an Oz. or two of brake fluid into the PS res. Has worked miracles in the past for me, including my '80. Granted it's not a permanent fix, or the best. I've done this to my Triumph Stag(which uses the same PS pump as a '69 Camaro) and a Chevy truck I used to own. If you have the $$$(which I don't, wife+kids) rebuild the whole thing, I would. Good luck!
Except for the cost new hoses [which you probably can't do yourself], the cost of rebuilding the P/S system [using kits] is one of the least expesive things you can do. If you find that the hoses aren't the cause of the leak, maybe the brake fluid "thing" can buy you a few months. But, order the parts and be ready to rebuild it when you can.