Torsion bar/shock options

Hey chaps, getting back into the hobby after a few years hiatus, and I am trying to catch up on the new trends, so please bear with me!

I have an Aus '65 Valiant, 318, power steer, air etc. I am considering setting it up for some track work. What is the current trend for torsion bars? I am reading a lot of people are using 1.03" bars, is this correct?

I am hoping to bias this car more to the track than the street, but it does need to be usable on the street and not be a total pig if I drive it to work. If I go the 1.03" bars will it be too much? I already have an extra leaf in the rear, and I can feel the front is a lot softer.

I also am considering Koni shocks with adjustable rebound. I know they are dear but I have a set on a BMW and they are hands down the best shock I have on any car. I would appreciate suggestions there too though!

Cheers,

Rob.