67 dart convertible trunk torsion spring length?

In re bending,,, to let the metal cool naturally is annealing so the temper is lost. You could then bend it, even drill a hole through it. To quench in water, oil, other, keeps much of the hardness.
And since someone questioned the spring strength... To heat at one end and increase the clocking or twist right there would be like altering 1 round of a coil spring. The trunk lid might jump off the latch when released but it would still have the weak spring float above quarter to half the travel. That twist was spread over much of the bars length.