Nicely Done!
what seals the sides, just RTV along the edge?
screws use the existing holes in the china wall?
is your cover trapped below the heads and mitered at the edge?
Edelbrock markets some valley covers, and there's an ebay seller that offers a piece with flanges turned up 45*, could be used as a head start or maybe contact him & see if he's open to suiting specific needs
https://www.ebay.com/itm/NEW-L...&hash=item51f212ecde
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