YES 5.9 Magnum manifolds work in early A bodies. Here is exactly how!

This was custom made while the engine and the 340 exhaust manifold was installed on the driver's side. I used a section of mandrel bent J pipe but it's actually better to use a mandrel bent 2 1/4" donut. The passenger's side (JGC) is a piece of cake for anyone.

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Thanks that is awesome. What flange did you use for that? So you welded the flange on the prebent tubing?