Timing chain set

There nothing wrong with buying an Australian made chain in lieu of USA made. The Aussies are good people and if they weren't so far away I'd consider buying one to keep around the house for odd tasks.

As for tensioners and chain stretch....it's important to note the chain tensioner puts tension on the slack side of the chain and mostly is there to keep noise down. It's not gonna do much, if anything, to affect the actual cam timing. If chain sloppiness is keeping you awake at night, use a gear drive.