I'm late to the game here. Ames has valve cover bolts 21/32" long for use with the thicker gaskets. They are bright zinc plated.
My method of straightening the dimples at the bolt holes in the valve covers is to use a 2X4 board standing on edge to set the valve cover on. use another wood block placed over the bolt hole to flatten the area. Sometimes, it's necessary to turn the valve cover over to hit from the other side. The wood prevents damage to the valve cover. This works very well--I've used this method for many years. I've also had better luck with rubber gaskets than the cork versions. Use sealant to adhere the gasket to the valve cover. No sealant is needed on the cylinder head.
As a side note, the '64-'67 GTO engines all got black valve cover bolts.
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