Because the motor mounts which are under the manifold are in the way and there is no way to get the motor mounts past the manifolds. The HO manifolds are way bigger than the standard log manifolds. Have you done it like that with a 67 A-Body with AC and HO manifolds? I believe the HVAC box is much bigger than on an AC car and this is also a factor because you can't just go straight up with it even without the trans on the back.
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Tim Corcoran
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