L78 CRD build code question

[rbvtwin]

I picked up this NOVA 22 years ago from a guy that had it in his shed for years and it has sat in my garage for most of all of that time. I just got the urge to get the thing on the road again (retired now so have the time). I was redoing the interior and happened to find the build sheet under the rear seat. I found and talked to the second owner and he said it was bought as a race car by a young kid in 69 (and he said it did come with a 427). The car is in excellent shape with only 14,000 miles on it. I was wondering if any would know what CRD means in the 4th code box (the car did not come with hardly any options at all. Will post pics when I find out how..... SORRY IT'S A 69 NOVA