Suggestions for new design Aluminum Mopar SB clean slate (kind of) cylinder heads

290 cfm will be a nice little head- even the Magnum R/Ts only flowed about 230, from what I've read.
On a side note, if you're having problems finding Magnum valve covers, check out Ansen. Black, bare or polished. Not a bad price, either.
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Mopar Performance Magnum Valve Covers - 5.2/5.9L (Black)