Around 1992 or so Rich Berlisk, John Grinwald, and Resto Rick Krueziger restored a 71 Demon 340 to a concours correct level. The Sept 97 issue of Mopar muscle has an indepth article on the undercarriage details of that Demon. Heres a pic of the cover. Well worth having to assist in your resto. Its the only info I've been able to find on that Demon and its resto details.
My torsion bars had white grease marks on the bars in addition to the blue paint blotches. Its thought the white meant the rear clips had been install on the bars?? The blue botches designated 340 bars and as you stated one splotch for the drivers, 2 for the pass.