I believe 73617 indicates a 8 cyl, 2door hardtop Beaumont Custom, and 831724 is the "unit number". A51 represents bucket seats. M35 is a 2sp Powerglide. (All of which you probably already know.) For a more complete break down, you can order the build sheet from GM Canada for about $80.00 from:
"So when you spot violence, or bigotry, or intolerance or fear or just garden-variety hatred or ignorance, just look it in the eye and think... The good outnumber you, and we always will." Patton Oswalt
