torsion bar suggestions for 318 Duster

I posted a similar post in the suspension forum and thought that maybe the race forum could give me a little more practical opinions.
In pulling the old exhaust we nicked a torsion bar with the cut off wheel so we need to replace it. The car is a 74 Duster with a 318 that we are building to get close to 400hp and then spray a 100 shot. It has 3.90 gears, XHD leaf springs and adjustable 90/10 front and 50/50 rear shocks.
Since we have to replace the torsion bar anyway what would the best ones be for a car that will be driven to the track and a few cruise ins but which we really want to hook at the strip? Thanks
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