excess positive camber 440 A body

Hello all,
A 73 Duster I just acquired with 440 engine has excessive positive camber with wheels on the ground. Probably in the range of 1 1/2". As you can imagine, the tires have no tread left on the outside edges. With the front end off the ground, the wheels move to about the same amount of negative camber. The torsion bars are heavy duty. Currently, the worn out old tires are 205 R60 15. We will be looking at several things to evaluate the suspension, my question is how much would tire width affect the ability to keep the car in some semblance of alignment. The rims are Cragar chrome 5 spoke and are fit with a heavy sleeved lug nut which securely locks in place over the studs. The car has front disc brakes. The rear tires are 255 R60 15. We will be checking the torsion bar setting and I am considering better, coil over shocks. What about narrowing the front tires?
Thanks, Brian
Here is a photo of the rim style

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