Torsion bar numbers???

This duster I picked up has a 716 bar on the drivers side and an 894R on the passenger side. It appears the previous owner only swapped the passenger side when they did the /6 to 318 conversion. Anyone know what number I should be looking for to match the 894R or should I find another /6 bar and crank them up a little bit to firm up the front end. Car will be a street / strip car for my wife. Not looking to make this thing run 5.80's and yank the wheels 6', just a good running / driving car that will work at the dragstrip...