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Bottom row. E31 is the engine code for 273 cid v-8.
According to the dealer's book, that was standard cost option - at least early in the model year.
The 1970 Hamtramck Registry - 1969 Dodge Dealership Data Book - Dart
D31 sales code isn't shown in that particular booklet, but its probably the 904 automatic.
L is dart, second L is lower option/cost base model. 23 is two door hardtop.
Looking at the sale book, H51 is the code for A/C equipped and I see it in the second row. Nice!
We see headrests and shoulder belts, the former became standard option around Jan of '69.