I did a frame-off resto on my wife's 69 Impala convert (a northern IL car from new) back in the early 90's and fortunately found no such rot....a lot of heavy scaly surface rust but no structurally compromising rust. The trans crossmember was another story....that thing was so thin in some places (rusted on the inside!) that I had to find a replacement.
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Bill Pritchard
73 Camaro RS Z28, L82, M20, C60
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