For the engine, it is entered twice on the tag.
The car's VIN, entered on the bottom row, is DL45 T1D 184xxx. The "T" is for the engine - 440-cid V8, 1-4bbl carb
Also on the bottom line, at the left side, is "E85". That is also for the engine - 440-cid V8, 1-4bbl carb
The exterior colour code is entered twice on the tag - once for the body colour and the second for the roof -
1) second row, first entry on the left - the body colour - GB2 -Light blue.
2) third row, first entry on the left - the roof colour - GB2 -Light blue.
The interior paint colour is the 2nd row, 3rd spot from the left - GB2 The "L2B2" between the body colour and interior paint colour is L2B2 - the interior trim code (L- low trim grade, 2 - vinyl bench seats. B2 - light blue).
The "G" on the various colour codes is for the Engineering Dept's model year code for 1971, and is the year that particular shade was introduced. The "B" is blue while the "2" is for the shade where "1" is light and "9" is dark.