The Performer is a toss up on 400 engines, but with that fairly aggressive cam and headers I think it’s wrong for your setup.
I see the Performer as a good performance street 326 or moderate street 350 intake, that’s about it.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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