Thermoquad Identification Help

I have a thermoquad off of a 73 Duster 340 4 speed. The car it is off of is very complete and original and I think the carb is original equipment. However, I am unable to identify it with the numbers I have been able to find and was wondering if someone has any input on this. According to reference guides the carb # should be: 6318s. However on the lower left corner of my carb I see a: 0022s. There is also a 319 3 shown. Neither of these numbers are on any of the reference sheets I have found, and am not sure what they mean. Any help would be greatly appreciated.