Just noticed that the Melling 3-350S set uses the same, S305 & S371 gears. The ad shows that the chain has a link which has USA on it. Didn't see that on my Cloyes chain. Don't know if that means Cloyes uses a different chain, or not. Makes sense that many of the cheaper sets would use the same components.
https://www.ebay.com/itm/1959-Throug...IAAOSwItNbSL4S
Here's a couple of chains that have Link Belt USA on 'em.
https://www.walmart.com/ip/Genuine-B...C350/424941037
https://www.ebay.com/itm/222350-TIMI...75.c1#viTabs_0