What's your opinion on the slack in this 318 timing chain?

When I checked the slack in Bazza's 318 last summer I ran across a little tidbit of information (here or elsewhere, I don't recall) that said that if there was 5* of "slop" between the timing marks when you rotate it backwards and forwards, it's worn-out. Not sure if that was "By the Book", but I followed it.

And I took a video of this for Bazza as well:



Another way of thinking about this: If there's slack in that chain, how accurate is your timing going to be, and thus, how well is your engine going to run?

Of course you could always just say, "Screw it! I'm already in here, and I may as well take care of it", which is what I would do.