The lower control arm spring nest isn't flat, it's spiraled to fit the non-flattened side of the spring. Thus the adjuster won't sit in flat. Also, you can't put the open-end portion of the spring up in the frame as it won't sit right.
The spring pockets on my '67 frames are spiraled just like the control arms and springs actually index better with the flat side down in my experience with my two 67 frames. Are the spring pockets of the 68-72 frames flat?
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