My lifters where also bad/soft but no ratling , i have the impression your engine sounds "fine" and its slight injector ticking (try the stetoscope! )
Replacing the lifters will not be cheap they are expensive and you also need new steel injector feeds
If it where your lifters than they are starved from oil due to lack/pollution in stead of leaking bad/soft if it is metallic noise .
Try an engine flush from forte and refill with new oil and forte top end additive
Also try an injector flush and clean the injector solenoids
even if it not helps clear the noise it could be helpful for fuelconsumption etc
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