I always use the Monte Carlo Jack on all my Mopars and other hot rods. On My '69 barracuda I found holes in the sub-frame and welded a stud (raised portion) onto the jack to fit snugly into holes in the front and back of the sub-frame. This jack has a high rise height and is pretty stable. I would never use an original bumper jack on any of the old vintage cars. I think I still have one spare Monte Carlo jack sitting on the shelf although you can find them on ebay.
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Treblig