In 1971, if you were saavy enough, you could order a '71 Highline Challenger with R/T lookalike stripes and a shaker hood, it is in all essence, an R/T, however, it doesn't have the R/T insurance premium. I remember seeing one at the Spring Fling years ago, that was, shockingly enough, ordered new by an Insurance Agent...
Doing a little hunting around I found these...
7/23/69: The 340 Performance Package (A66) will be available on the hardtop and convertible models in conjunction with the 340 engine in early September. The 340 engine will only be available in combination with the 340 Performance Package.
4/13/70: The Shaker Hood is now available on the Challenger R/T with the 440-6V and 426 engines. In addition, this hood is also available with the 340 Performance Package (A66).
Production numbers for the A66 cars totaled 6,933 for the USA, export and canadian totals are not known, if any at all.
Now with that being said the other guess I would make about no 340 R/Ts in '70 could be because it might take the spotlight of the 2500 (or was it 2724) Challenger with a special 340 option...?
I thought the 340 "decal" as opposed to the emblems were really cool, and yes, I think it would make a cool tattoo...