Small block pulleys 1968 273 318
i think i might have what you need
silver pulley is double groove 5 7/8" dia and 2 1/4" tall
black pulley is single groove 6 7/8" dia and 3" tall
black crank pulley is double groove 7 1/4" dia and 3.5" tall (inner groove appears to be 6 1/4")
shoot me a PM if you need more pics. also, i'll be at fall fling with them (and a bunch of other stuff) if you needed to match up or eyeball fitment.