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Penetrating oil like PBlaster may help if the fasteners are ceased. If you rounded the nuts go to an auto parts store and look for a set of sockets designed to grip rounded fasteners...I had to buy one a few years ago for a stuck rounded exhaust manifold bold on my Lincoln and it did its job.
May also be it's designed to come out the back. I've got a different chassis Maggie from the late 40s and the front of the chassis has hooks to hold it down and those hooks only allow it to be removed from the back.
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