Right now you're doing a lot of parts changing at once. Obviously you've come to the conclusion that your 318 bars will be too soft as compared to the rest of the suspension. I've been hearing mixed reviews about the 1.03" bars (namely PST has the clocking off?) so you may want to look into another brand/source.

From my experience, you're in the ballpark with 1.03" torsion bars. I'm using a Just Suspension 1" t-bars on my Challenger. They were too stiff with stock leaf springs and no rear bar, but now that I have a rear sway bar, I now need to upgrade my front torsion bars (about 1.03" would match right now with my stock leaf springs).

If you can, see if you can find a source for the 1" bars, or maybe somebody is offloading their 1"+ bars cheap. You're changing a lot all at once so you may want to get a feel for the car before you finish dialing it in.