I'm not going to speak for the original poster but maybe he's referring to what they are, could be? I know X33,X77 are Z's. X22,x66 are big block cars etc., but the X44,X55 are a little confusing. Some Copo's are X44 some X66's? What were SS350's coded? Maybe I'm off base here.
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70 Chevelle Vert L34 M21 28-A 791
70 Chevelle Cpe LS6 M40 14-14 756
70 Chevelle Cpe L?? M?? 926-99616 755
69 Chevelle Cpe L78 M21 71-B 756
70 Chevelle Cpe L34 M20 48-48 796
70 Chevelle Cpe L34 M40 75-75 788
70 El Camino L34 M20 28-C 765
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