school me on differences between Dart, GT, and GTS?

ir3333 said

i think LH23 was still around in '69 but maybe not 270?

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in 69 an LH23 was a dart custom.....68 was the final year for the 270 which was also designated as LH23.

both of these cars are LH23 ......LH23B8BXXXXXX and LH23C9BXXXXXX

the 68 is a 270 and the 69 is a custom