If your depending on the vehicle for reliable daily transportation, I say keep it all stock. Like you said, picking and choosing from some of the HO parts will likely make for worse performance/reliability, you've got to install the whole package. Not to mention, just the cams, don't be surprised if fail emissions inspection, if you have to get tested in your state.
Timing Chains should last the life of the vehicle, that is NOT break, they will stretch and effect engine performance, but its just a matter if they have stretched enough already. That you should have accessed before you pulled them off, if they didn't have any slack in them before pulling them off, I'd keep the OEM chains and put them back on. (I don't have any experience with timing chains on the newer motors, if someone with more experience offers an opinion, I'd listen to them.)
Bear in mind, in many cases replacement parts are inferior quality compared to the OEM parts, so a replacement chain may stretch more than the OEM chain is currently stretched in very short time.
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