A6 Carbs would not be correct for that car. Carbs had to lead a build more then that. I have a set of L5. Since this is the beginning of production for street hemi and carbs, L may have been the earlies made, but I do not know for sure, there could be earlier carb dates. F8 were the dates on the very early 69 Car with AUG/Sep SPD. They were made in batches. So not like they were made every day of every month. Pretty specific manufacture dates for hemi carbs.