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

I'm tearing into this because of a coolant leak between the timing cover and the block, otherwise I wouldn't be here. I was curious about the condition of the timing chain. This engine was bought from a Chrysler dealer, it came from an authorized rebuilder in Toronto (Ontario Reman) circa 1986 and I might have 10k miles on it at this point.

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Sprocket made in Canada? Links made in Japan?

From what I read, even new timing sets have slack, maybe more than some people want or expect. I didn't measure the slack here, I can, but it looks like 5/16 inch. I haven't driven the car much in the past 2 years (was in storage for 20 years before that) but I'd like to see a smoother idle, don't know if it's the crappy gas now, or my expectations of 550 rpm, or the carb setup, or still having points (not electronic) ignition - or this chain?

I'm going to have to decide in the next couple days if this chain is staying on or if I'm going to replace it. Comments?
Probably fine, but change it if you want.