Milling Intake Manifold

Louie70Dart said

If it was me, I would take the heads off and have the intake side milled on each. That way as long as those two heads stay together, you can use whatever intake, ootb. Otherwise that intake can only be used with those heads only.

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That would be a good idea but I'm using Magnum heads and there is only two dual plane intake that fits these heads, and the one I have is a Mopar M1.