I know most original 71 big blocks I've studied had the one piece, I always figured any with the three piece likely got changed... I know in 71 the 440-6 throttle linkage changed to one piece.. If they changed something as limited production as that I would think the run of the mill two & four barrel cars were certianly changed... My 71 Hemi was a 4spd & the bracket like everything else had been changed...