had some unusual mads done to them remember that prior to 73 few p/s cars had a "full tube chassis" .the unibodies were largely intact then a "rollcage was welded around the driver
one of the mavs that tom smith made for possibly gapp and roush had a "false bottom" in it .he would join the subframes with square tubing on top of the original floor pan then weld another floor pan on top of it so the connectors couldn't be seen . I would imagine that this was worth a good bit of et until the secret got out.
Who do you think you are !? Barney Oldfield !?