Re: 72 K30 Build
Looking at this more closely with a tape found the majority of the frame seems to be square. Not so much from the front cab mount area going forward it hooks to the left side.
Left rail was twisted inward right about ½” at the top where the engine crossmember goes, and then it continues kicking out left going forward. Right rail looks perfect but does bend gradually to the left no twist found. You can kind of see it in these comparison pics.
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