Torsion bars for better handling; your experience?

I'm in the process of rebuilding my front end.
I have qa1 upper control arms, KYB gas shocks, q1a lower control arms.
Stock 73 K member
hellwig sway bar

manual steering
340 engine with 727 auto
Kmember is from a 73 dart, I am going to run 11.75 discs and the late 70s single piston caliper.
I still need to decide on a size for my torsion bars ???