Does it look anything like this?
1951 mercury coupe hod rods wallpapers - Hot Rod Cars
No side view mirrors on that red one.
From the same link, one with mirrors.
Do you have side view mirrors? They might be a source of wind noise.
If you have vented windows and mirrors like the black one below, perhaps those are noise sources.
https://www.barrett-jackson.com/Even...M-COUPE-138049
The devil is in the details, we need more information, and visual is best.