I would like to refresh this post for all the information that it is generating.
I would also like to add my engine to the others.
A little history of the car,
1971 Plymouth Cuda,Sassy grass Green 4 speed SPD feb 71
* means not original to engine
Engine color Orange
Block cast 8-30-70
Block assy info stamping CW340P34260406 assembled Dec 14,1970
Intake manifold cast date * 10-22-70
Waterneck 2780970
Oil pan stamped 294 no welded tabs
Temp sending unit stamped 250 date M1
Waterpump housing 2951698 Date 10-70
* Carb 4972S Date I 0
Heads J

That's all I have for now.
Can't figure out the date code on carb.
Thanks and hope this helps with the research,it is sure helping me.
Bob T.