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

Garethw said

That what I was also wondering. Wonder how thick those manifolds are in that area.

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On the Jeep Grand Cherokee (large hole) magnums there is plenty of casting thickness. The smaller hole manifolds like the ones used by Tab are still pretty thick. But the casting numbers are actually in addition to the manifold itself as well as that "nub" you see on the manifold. You can easily remove the numbers, the nub and a good 1/32 (smooth out the rough casting) without any issues. I actually dished out the large hole magnum manifolds for a early A in the inner fender well area!!