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The only chassis that will come close to doing what you want would be the 93 model year only 4 door chassis. You would have to extend the frame on any of the other chassis, If you can find one of these golden eggs, the swap would be a cinch, most likely use your 68 mounts and weld them to the frame. It would really be cool to fab that interior complete with dash into the 68.......very cool good luck!