That page lists it as EA. I'm a Nova guy, so I did not have that on my spring list.
I would still like to know if the car was a early 09D or late 09D.
Now this looks clearer. It looks like they changed the Assembly code for the same part number. That is why I asked Doug to try the spring calculator. It uses the table on page 7-65. I only published the Nova springs on my site.
BTW they figured that these calculations were to difficult. So in 1970 the service springs were greatly reduced for the Nova. Also the later parts books eliminate spring numbers and add letters to other part numbers. On springs you have to use the closest parts book to the year of manufacture.
Greg
Oh yeah 3955707 was the one listed for a 66 Chevelle. Se page 7-15 last line.