Not trying to start one of those long endless discussions here - just thinking about possibilities. But any corrosion with stainless tubes would occur within the head casting and not the tube as the stainless would be the more noble metal. And yours are quite clearly stainless of some type. Proper recommended antifreeze would prevent galvanic corrosion to tubes just as it was supposed to prevent corrosion after the timing covers were made aluminum. Same problem different location. Salt as Ben M points out would be very bad as it makes a good electrolyte.
Anyway, as you are apparently faced with reusing the tubes you have be aware that there are left and right in a 59 engine. Not sure why as the heads are essentially interchangeable except which end has plugs in the core holes to make them left and right.
Only other curious statement I find on the subject comes from a Motors Manual which says:
"A water distributor tube (inlet tube) is located in each cylinder head. Whenever a valve job is being done, these tubes should be pulled out and examined. If damage or corroded install new tubes."
So at one time replacement tubes were available. Just had to be installed correctly.
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