All connecting rods are copper plated before going thru the heat treat process...so are cams. The copper protects the steel from damage when exposed to the flames in the oven.
Most make it thru the tanks that remove the copper but some don't.
I paid $180.00 to have my 340 rods resized and ARP bolts installed...fair price. I' d sooner use all of my Mopar stuff than buy offshore parts... keeps my machine shop in biz and I trust Ma Mopar's metallurgy more than Fu Man Chu's.