Nikki Identification.
 

I have a stock Nikki carb 1972 rx2 that appears to be slightly different than most.
Instead of the fuel lines (to and from carb) being exposed along the top of the carb, mine are incorporated into the body of the air horn, also looking at at the choke opening, mine is at least 20% larger than most i have seen?
Any ideas? Reason for my concern is that I cannot figure out where the second check ball goes and cannot ID the "weights" in my rebuild kit GP Sorenson 96 555?
Thanks for any clarification...