@DaytonaRS7 I've heard 2 scenarios.
1) If you don't have chain issues you might be one of the lucky few.
2) Change the timing chain tensioners and guides, but while your at it there's a slew of other things to do.
If you fit into #2 then, chains can stretch. Mine didn't, I checked it against the new chain. With that said, I skipped changing the oil pump chain and guide and reused the old chain. My theory is, if there was any micro stretch on any of the chains changing 1 chain will throw off the timing.
Other things to do while you're in there is cooling (water pump, oil cooler pipe, thermostat, cooling pipes, upper crossover pipe, rear crossover pipe, etc...), valve cover gaskets, injector cleaning, injector gaskets, cleaning carbonized valves, cleaning the old oil buildup in the screws behind the cam sprockets, and other minor things.
You can definitely do the shortcut way to resolve the major timing chain tensioner/guide issue. However, if you truly want a peace of mind I recommend taking a few more hours and extra parts to pull off the injectors and valve covers. It's actually a few more $ to replace the injectors than to send it in for ultrasonic cleaning, blueprint matching spray patterns, and new o- rings. The valve cover rubber gaskets are infamous for leaking over time, so, might as well address it.
That's my 2 cents.