What other documentation do you have on the car? Have you thoroughly searched for a Broadcast Sheet?
There are known LA-built E-bodies that have a Broadcast Sheet.
The
standard engine on a 1970 Cuda (VIN starting with BS) is the 383 with a
standard 3-Speed manual. That is why it is always questionable that a 340 or 383 car is a factory 4-speed without some extra documentation to prove it had the D21 - 4 Speed Manual Transmission Floor Shift (A833)
option. The 440 and Hemi Cudas came standard with the D21 4-Speed.
The Broadcast Sheet, Window Sticker, or a dealer Invoice is crucial proof for purists.
Your car is definitely a Cuda 383 4-BBL and likely had the D21 - 4-Speed option as very few 3-Speeds (not desirable) were built.
The most desirable option on your repro fender tag is the V4X - Black Strobe Sport Stripes (Vinyl Decal).
Proof of the V4X option would make your car extremely rare, far more so than a 383 4-speed with A/C does.
Truth be told, you have a real Cuda 383 manual car that might have come with the V4X strobe stripes. I personally would search inside the dash above the glovebox liner, under the carpet, inside the bucket seatbacks, inside the rear seat springs, and make absolutely sure you do not have a Broadcast Sheet in there.
All of this only matters if you want to know the true options. You can always put the strobe stripes on the car and tell the story "as is" even with the repro fender tag.
Another route would be to capture the repro tag's VON (if correct) and put together a much better repro tag but without documentation for factory options that tag has no real foundation.
Build it how you please as it is your car. I hope some of this info has at least shed some light on where the car stands now.