looking to get the production numbers for my project car, a 1966 Grand Prix 421 tri-power 4-speed car. anyone out there know where i can get the actual amount of these were made? it is a 356 hp motor, 4-speed muncie with a hurst shifter and a tri-power intake, all stock. i have it narrowed down to one of the 917 manual trans gps and one of the 546 pontiacs with that specific engine/intake/trans setup. that is as far as i can narrow it down. thanks.