Nice polished aluminum Cal Custom SB Valve Covers
Those covers appear to be in great shape, but they're polished aluminum not chrome.
IMO, the polished aluminum valve covers are more valuable than chrome steel. The Cal Custom covers polish up nice and give a great 'old school' look with the fins extending down to the flanges on both ends.
Good luck with your sale - I've still got the Cal Custom covers I had on my old 340 Swinger years ago. Thinking about using them on the 360 Magnum in my "new" '69 Dart.
Somebody will jump all over those covers at that price! In case anyone is wondering, yes you can use 5-bolt covers on newer 10-bolt Magnum smallblocks.