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mAYBE THIS IS BETTER
In 2 of these you can see the fixture I wrote about made out of some channel iron with a center section reversed so a block can lay on top of it locating the crank centerline at the top of frame rails

also ,maybe, you can make out in the first pic toward the rear end that I had made a tube that was the length midliength of shock travel length(ride ht) for the rear end so chassis sat at ride ht as I worked on/mocked stuff up