I don't recall a MP 400 Camaro but could have been one.
I recall articles on Motion 350 LT1 Camaros and Vegas around 1973
Maybe you are thinking of the 1972 Yenko "Super Z" 400 Camaro ?
there was a prototype built and it was tested by Car Craft Magazine
it had a 400 cu in small block with 350/350 cam, aluminum intake and Holley
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