Leaking valve covers are usually from bad installation. They just need to be snugged with a good gasket, glued on the valve cover side, and load spreaders. Dont hamfist the bolts and bend the cover.
As for new, and Chevy restoration parts place will sell them. Classic Industries, Year One, etc. if you want new, used, just run to your local junkyard. There will be tons of them there.
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Good rock and roll music should corrupt the young, it should corrupt them enough to think for themselves.