Without the build sheet is there really any way to tell for sure what tire and wheel combination any particular car came with , outside of the standard tire / wheel option????
there are a number of original details that can point to possible original tire/wheel combinations (cars were built by people and any of the following could've happened by mistake)
1970 'cuda:space saver spare was a "mandatory OPTION" with 15" tires & OPTIONAL with 14" tires (& stud to mount spare in trunk was in different position full size VS. space saver)