Original set up the bolt came through the front of the alt and went into the exhaust manifold. That is the lower pivot. Front bracket went from the intake to alt. That is the sliding mount.
Sounds like it has been changed over the years. They sold adapters that bolted to the front 2 exhaust manifold bolts way back. This provided the mounting point if the manifold was changed or it had headers.
My first car was a 66 chevelle 327 4 speed. I am very familiar with this clusterfrick of engineering.
Last edited by chevymaher; 12-12-2019 at 07:49 AM.
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