I have seen and worked on a 408 from T&L.
First fired the engine and heard a bunch of racket, found out the rockers were hitting the valve cover baffles. When we pulled the covers off, they had double gaskets? WTF, from a "Nascar" shop, and then we found where they had already beat the baffles up into the covers with a hammer.(some real top notch junk)
After many unreturned phone calls, the owner finally recieved the right valve covers.
After a few miles the oil pump siezed, it was repaired by a local shop.
They CLAIM to be a "Nascar" shop, bull ****. They may have at one time built a Nascar engine, but that does not mean that they are still in the game.
Would a reputable builder, sell there stuff on Ebay?
10 dollar an hour monkeys throwing half ass parts together. Good luck to anyone that is sucked in.
I have seen enough to know better.

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Git R Dun