[Fhakya]

If I remember correctly, just over 70 Barracuda's and about 50 Dart's were produced (may have that backwards).
Things to look for:

-Fiberglass fenders/hood
-seat belt based side window mechanism
-radiused rear fenders
-heater and radio deleted
-Dana 60 on a 4spd car, 8 3/4 rear on auto
-aluminum (?) seat mounts w/ holes drilled
-lighter A100 truck seats
....just off the top of my head. There's a number of other things to look for.