Re: the "-1" or other "-#" . I contacted one of friends from Foundry pattern/tooling dept to verify my understanding. The dash number after the part number did designate the specific tooling pattern set used to make the block mold. That was used to track in event of a defect found from tooling wear. Same reason for date, clock & day/night characters that are cast into the block. Regarding the count info: As I noted in my text, the accountant that gave me the report told me the 1964 '426 count' was 426W & 426 Hemi because accounting evidently didn't need to differentiate. From accounts in articles by Chrysler's Tom Hoover and Willem Weertman regarding work on the blocks in late 1963 until the 11th hour before Daytona, those blocks were likely considered non production and were not included since such a low count. Production was counting in 'thousands' so makes sense that 426 Wedge blocks were folded into the 1964 count.