Big block chrome dripper valve covers 2 Q's

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I would like to know what do these actually fit as the only pictures I could find of an engine with them on was a ZL1 and an L72. Also what would they be worth? They are in very good shape (didn't clean them before the pics) with one small ding in one about 1/8 x 1/8 and may be able to be polished up without rechroming although I would plan on rechroming them.

Thanks guys,

Mike