White interior was not an option on the 1970 Electra Custom convertible. I agree black is a bad choice however. Interior colors for the convertible were: Black, Red, Burnished Saddle (dark brown) or Sandalwood (beige). Black Cherry was not an original color either. I cannot tell by the photos but maybe this car is the original Burgandy Mist color. The Sandalwood color would be a perfect combination.
The top of the line was the Electra Limited, but not available in a convertible. But the brocade cloth interiors in the Electra Limited was jaw droppingly beautiful and the most comfortable with its extra padding.