Let me clear up something about the engine frame mounts on 68-72 specifically.  There are 3 different ones and they are as follows:  6 cylinder, 307, and all other V-8s.  The 6 cylinder mounts are obviously different.  The 307 mounts are in a world of their own and are taller than the other V-8 mounts.  You must use a 307 engine mount on any other small block if that's what the car originally came with.  The other alternative is to swap out the frame mounts for a non 307 V8 application.
 
Tom

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