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the top one with the two holes and two slots is the alternator mounting bracket. the two holes are mounted to the cylinder head around the header tube. there should be a double "L" bracket that mount to the two slots and the alternator is mounted to that.
the lower bracket is a shifter mount for a hurst shifter. the bracket mounts to the tail shaft of the transmission and the shifter mounts to it. the threaded holes in the bracket are what the shifter attaches to.