Just a suggestion, but plenty of help/info available here
http://www.cobraclub.com/forum/dax-technical-questions/
If not, email or call Dave Brookes, who is a Dax build agent.
http://www.v8cobra.com/
If you get the new Dax De Dion chassis rather than the old ladder frame, Id be very surprised it didnt pass any torsion test.
Let me just say I have never owned a Dax and have no connection with any of the above.
HTH, Kevin