the throttle/kickdown bracket installed on the carb the way the instruction show, with the bracket sitting directly on top of the carb mounting flange, put the bracket about 1/2" to low on the summit m2008 carburetor. The wires went diagonal up to the linkage. With that happening, I had to fabricate a thick piece of metal to correct it. IDK if the throttle pressure lever is different on a 81 j body, but the trans mount in the kit worked fine, its just a little flimsy for my taste. Im a little worried a rock or road debris would throw it off or bend it. Again, this is just my experience on this particular setup. I dont think summit carburetors existed when these came out.