Front/rear suspension options?

Looking at a '71 Dart, no K frame or rear suspension. What's my options? MustangII? Straight tube? Or find a good K frame?
Are torsion bars the way to go, or swap to coils?
Stick to leaf spring rear? Probably use a Ford 9".
Planning a hot 360/727, maybe 400+ hp. Dedicated drag car.
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