What is the cost to replace a 2002 Ford Explorer Sport Trac timing chain

https://repairpal.com/worn-timing-chain-cassettes-may-cause-rattling-noise-from-engine-764# https://www.rockauto.com/en/catalog/ford,2002,explorer+sport+trac,4.0l+v6,1385355,engine,timing+set,5756 Probably best/cheaper to buy a used engine from a scrap yard....lots of problems with the chains on the 4.0L vin E engines.