the bushes are only happy in one position and that is with the bolts being completely in alignment with each other, they tolerate the bolts being out of alignment for adjustment purposes. If you were to look through one bush it should perfectly align with the second. You cannot do this with the offset bushes, they will be parallel but offset. To do what you describe and to get perfect bolt alignment you would need standard bushes in the arms and to move the front most part of the front bracket a little more than the rear most part of the front bracket and the rear most part of the rear bracket more than the front most part of the rear bracket, and all angled slightly.
imagine putting in steel sleeves instead of rubber bushes into the arms. The bolts would have to perfectly align to each other for the arm to be able to swing but as soon as you try the adjustment by moving the position of the bolts in the chassis the bolts will not be in alignment with each other. yes you could fit offset steel bushes and have offset bolt alignment but the arm will be fixed in one position as the only way it'll then move is to bend something.
I have spent many hours fabricating, fitting and aligning bronze bushes for a 427 Competition Cobra's suspension arms.
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