Mopar big block 1 piece kickdown linkage question

I have a one piece kickdown linkage assembly (70's) for a big block. How can I tell if it is for a "B" or an "RB" engine? Is there a measurement for the one piece rod? This letter/number combo is stamped on the engine end of the rod: -B- 761.

I don't have a engine\tranny to test it on.

I have attached a photo of it.

Many thanks

Moparmoondog

my guess is probably 3462761 rod - Chrysler/Imperial or station wagon w/440 - last 3 #'s correspond to parts book - I've done some looking into the kickdowns, some have the #'s, some don't - Joe

Thanks for the information.

Moparmoondog

I know that the rod attached to the carb is shorter on the 2bbl than the 4bbl.