Sorry I missed your call yesterday. Busy with the farm. The copper flakes are nothing to worry about. The rise of coolant is fairly normal. You might want to install an overflow tank. Unless the temp is getting above the 220 mark I wouldn't worry about it. Since you have a few miles on it now and have gone through a few heat/cooling cycles you might consider re-torquing the head bolts. You got this.
drive


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)