Check the strut towers... make sure they are not banged up in the rear from stuff rolling around... I see that a lot on the S13's.
You can grab a yard stick and get measurements for the front strut towers.... its easy to do and only takes a minute.
Also check the frame under the car....
If you are worried the chassis might flex because of high mileage I'd suggest seam welding and possibly a few bars welded to the strut towers in the rear while the car is stripped.
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