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