I screwed up, I thought I was in the engine forum.
Justhorsenround you are correct. I'm in the wrong forum.

What I am talking about is the Rochester Carburetor Throttle Lever.
The lever that is connected to the throttle rod that goes through the Body Assembly of the Carburetor base.
The lever that the horizontal linkage rod is connected to. Grp # 3.430 Rod Check illustration Below.

Auto Choke Carb illustration Check Lever N.S.S. at bottom of picture

Maunal Choke Carb illustration Check Lever N.S.S. at bottom of picture

Looks like there is a Carb Body Assembly Grp # 3.729 just for 55-56 Passenger and 54-57 H.T. carbs. Check Grp # 3.729 part # 7007984
I wonder what is different, the throttle Lever ?
Do you have to use that Carb Body Assembly in order to use ether a auto choke carb or manual choke carb on engines equipped with a HM trans.?

HM trans. Linkage illustration Grp # 3.430 Rod