Well, I've done a little research and made some changes based on what I learned. I found
www.chevellestuff.net. They have lots of information.
STYLE: 64-5867=1964 Chevelle SS convertible
I don't know what the BODY EP 1580 is yet
TRIM: 714=black imitation leather buckets; 1=white convertible top
PAINT: 948=Palomar Red (maroon) - don't know what the "A" is for
ACC: the accessories are broken into 5 groups
Group 1 - E=tinted glass; Group 2 - L=4-speed S=rear antenna; Group 3 - C=padded dash; Group 4 (n/a) Group 5 - can't find a code 7.