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I’ve run the same set of Sanderson headers on my 350 for 25 years. Seems like pretty decent durability to me and not my first long term durability exposure to headers. Except for the rigors of racing I haven’t experienced any long term durability issues with headers at all either personally or with my customer builds.

Things I’ve noticed is when first mounted they may take upwards of a couple years to stop blowing gaskets unless further installation action are performed. In regard to leaks the choice of gasket makes a difference where the fiber or fiber in screen are the most failure prone and need to be replaced when they do blow. Stamped soft aluminum and better yet copper are more resistant to blowing or burning when a leak does occur. To fix these usually just relieving the fastener clamp load then retorting them puts the problem to rest for a long time before needing to to it again. Like I said above this eventually goes away as the headers restructure their internal fabrication stresses with repeated heat cycles. The thick carbon, carbon gaskets are pretty much bullet proof regarding periodic leaks almost set and forget.

I have found that including a flex section in the connection of the collector to the head pipes works wonders in reducing to eliminating thinks like cracked cast manifolds or header flanges and tubes as well as pretty much eliminating gasket sealing issues. Observation indicates to me that a major cause of these cracking and sealing problems is the combination of heat cycles with differential movement of the engine on its mounts to the exhaust system hung from the chassis. I found that this works equally well with a section of about 2-4 inches of cheap flex exhaust pipe as a bridge to the head pipe with screw type exhaust system band clamps or the showy and expensive stainless overbraid flex joints.

Bogie
 
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