340 Valve Covers, what years and WIW?

[JH27N0B]

I have these valve covers I don't know what year 340s they are for, only that they aren't the same as the ones on my '70.
Also, what are they worth.  I also have a single '70 passenger side valve cover.  What is it worth?

[Daveh]

I had them on my 340 and the engine was a 69 although I can't verify that they came with the engine.  I replaced them and got $40.00 for them and was happy with that.  Hope that helps.