Low ratio steering boxes

Hello everyone. It's been awhile! Anyway, the steering on my '70 slant six duster is scary! The car has 80,000 miles on it. I had it aligned about 3 years ago but haven't driven it much. The guy who did the job said everything looked good as far as the components go. The car drives VERY straight!! Perfect tire wear too. So...I want to improve the steering and so on because it's hard to keep it in the lanes. The car has power steering. I was looking into different boxes but there's so much info out there as far as ratios go. Right now it takes 3 1/2 turns to go from lock to lock. Which box is best? I looked in Borgeson boxes, I heard a Firm Feel, redoing my box with different components, different quick steer pitman arms...etc. What should I do? Any help is much appreciated!!