Just seen your latestest post. A 73 will have the holes in the frame but use a different frame mount. Just get the oh, say 76 frame mounts at a parts house. Tell them you need the motor mounts for a 76 400 T/A. Then with the clamshell brackets on the Pontiac engine, and bolting the trans to the engine and locating the trans mount on the crossmember, you will see the holes to bolt the frame mounts ( parts house "motor mounts") into.
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