Welcome to the board!
That is a cool car, and the rust isn't bad from what I can see in the pics, the floors will be an easy fix, and the trunk doesn't look too terrible either. What is odd about it is the interior, it appears to have a 1970 Cuda interior swapped into it ? (the seat color and pattern and seat back style are 1970, so is the Grand Coupe style overhead console) I've never seen either in a later year Cuda/Barracuda. Also, it's lacking the Grand Coupe door panel inserts which would have typically come on a 1970 car equipped with the overhead console option.
Yes, the color is Lemon Twist / Top Banana Yellow (same color, two names) the factory paint code for that color is FY1.