Difference between 70 and 71 Six Pack carbs

What is the difference between 70 and 71 six pack carbs? Can you run a 71 carbs on 70 motor? Is it only the numbers? We are talking about 71 carbs. 4670 and 4672 compared to 70 carbs 4365 and 4144.

Holley made a lot more 1970 six pack carbs than you listed, there are automatic carbs for the 49 states beside CA and automatic CA carbs also, same thing on the stick shift carbs.
You can run any and all of the different ones you have access to on any six intake and they will work as long as you don't care if they are the correct year and part numbers for you car

Thanks. I meant the difference between the 4365 and 4144 compared to the 4670 and 4672.

You can go to Holley on line catalog on carbs and look those carb. $s up and see what that does for you