Don't 50's come with an x-frame? I took the one out on my 55, the ends were rusted away, wasn't doing much good anyway. It weighed maybe 20 pounds, it was a lot lighter than I thought. I was going to box the frame in and figure with the added trans crossmember and one similar for your 4 link would be enough. I notched the back half too and moved the leafspings inboard, ending up with about 18" of wheel well on each side.
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