there is a list # stamped into the carb body , on the choke horn on the center carb & on the back of the front & rear carbs the front & rear carb will be sequential for example 4789 & 4790 , these are the small block carbs & I cannot find the big block #s as all my books are gone now . there is also a date code , the first 3 # are the day & the last # is the year so you should have something like 1519 for the 151st day in 69
If I was 1/2 smart I would buy it too