I looked through some b'cast sheets I have.
The last 3 digits are on the b'cast sheets of:

1971 Charger SE 440 4-spd 3.54s 794L/964R
1971 Road Runner 440+6 auto 3.23s open 794L/964R

but not on:

1971 Charger R/T HEMI auto 3.55s S/G 793L/963R
1971 Road Runner 383 auto 3.91s S/G 212L/212R