That manifold looks like the one in this Mopar Performance catalogue - it is the 4th one listed. It looks to be made by Weiand. I zoomed into the catalogue picture. Note number 8015 on the runner.
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I have the same intake although mine says Weiand and not Mopar. It has the same 8015 on the runner. Bolt pattern is the W2/W5 pattern. Port size is the same as a standard LA head.
A lot of work to match to a W2 oval port but less work to match a W5.
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