72 Duster twister with the 275 horse 340 engine?

Do you have PROOF? I bet you DONT........

I read about it in different books (MUSCLE CAR CHRONICLE, DUSTER/DEMON SOURCEBOOK) and I have seen some 340 Twisters in the web - not face-to-face (this is difficult in Old Europe) - and here is one, who claims to be original:

http://www.hemmings.com/mus/stories/2010/02/01/hmn_buyers_guide1.html