My 2 cents. Stiffer bars are the way to go, you have to make sure you have a good quality shock that go with them. My '68 Dart is 3500 lbs w/o me and with a full tank of gas. I have 1.18" T-bars and Fox Adjustable shocks. It drives like a modern car. I want a 1.24" bar.

As for left bars or right bars... idk anything about that...