Help With Fender Tag Decoding

No 915 heads in 69... they were all 906 heads at that time.

the "68" is a delete code for the rocker stripe.

Here are the engine, rear, trans codes for the 915 596 605 numbers

Engine
897 - 383 4BBL, manual transmission, A/C, 330hp, Turquoise
899 - 383 4BBL, automatic transmission, A/C, 330hp, Turquoise
900 - 383 4BBL, automatic transmission, heater, 330hp, Turquoise
915 - 440 4BBL, manual transmission, heater, 375hp, Orange
916 - 440 4BBL, automatic transmission, A/C, 375hp, Orange
917 - 440 4BBL, automatic transmission, heater, 375hp, Orange
921 - 426 Hemi, manual transmission, heater, 425hp, Orange
922 - 426 Hemi, automatic transmission, heater, 425hp, Orange
925 - 383 4BBL, manual transmission, heater, 335hp, Orange
926 - 383 4BBL, automatic transmission, heater, 335hp, Orange

Rear Axle
589 - 3.23 open, 8 3/4, 10" rear drums - front disc
591 - 3.55 s/g, 8 3/4, 10" rear drums - front disc (A36 Pkg)
592 - 3.23 s/g, 8 3/4, 10" rear drums - front disc
593 - 3.23 open, 8 3/4, 11" rear & front drums
594 - 3.55 s/g, 8 3/4, 11" rear & front drums (A36 Pkg)
595 - 3.23 s/g, 8 3/4, 11" rear & front drums
596 - 3.54 s/g, Dana 60, 11" rear & front drums (A33 Pkg)
597 - 3.54 s/g, Dana 60, 10" rear drums - front disc (A33 Pkg)
642 - 3.91 s/g, 8 3/4, 10" rear drums - front disc (A31 Pkg)
643 - 3.91 s/g, 8 3/4, 11" rear & front drums (A31 Pkg)
644 - 4.10 s/g, Dana 60, 10" rear drums - front disc (A32/A34 Pkg)
999 - 4.10 s/g, Dana 60, 11" rear & front drums (A12 Pkg)

Transmission
091 - 727 Automatic Transmission, 383-4BBL engine
093 - 727 Automatic Transmission, 383-4BBL & 440 HP engines
094 - 727 Automatic Transmission, 426 Hemi engine
603 - 833 4-speed Manual, 383-4BBL engine, (23 spline)
605 - 833 4-speed Manual, 426 Hemi & 440 HP engines, (18 spline)