There is no reference to any 340 four barrel Challenger emblems/nameplates in any versions of the 70 parts book, I have checked them all. The V8 emblem appears to be the emblem of choice for all cars that are either 318, 340, and 383+2 equipped cars. The 23 section of the 70 parts book(all editions and changeup additions/supercessions) show the JH hardtop model with a flat hood only, and either a V8 or 383 four barrel emblem on the fender. It is as if the 340 motor in a Challenger did not exist in the parts book for 1970.