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Just on a personal note since I've gone through about a half dozen engines on prior cars and trucks. If you want reliability, stay away from upgrading the internals of an engine unless your prepared to change all the internals.
If your gonna swap cams, than do springs, rockers, pushrods, lifters, valves, heads, timing chain, pistons, rods, etc... Each stock part is more or less matched to each other where theoretically not one item is necessary a weak link in the system.
But say you add a high lift cam, your stock springs will become stressed, if you change the springs along with the cam than your gonna stresst the rockers, you change the rockers you should change the lifters and push rods, etc...
One upgrade will effect everthing else, sometimes to a greater degree than tolerable thereby affecting reliability.
Hope that makes sense, again just my opinon.
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