How Many Turns for the Torsion Bar?

nothing set in stone. a larger bar will take less turns then a smaller bar does. best bet is move each bar a full turn or two and see what happens. then go from there.

Totally agree. It will depend on the torsion bar diameter, how much "sag" it has had over time, etc, etc.

Only way to do this would be trial and error. With stock sized bars a turn at a time would probably be the way to go if you're starting from the current ride height.

he is doing a large bolt disc brake swap. track width widens with that.

Yup, no way around that. And the factory parts did that, the factory didn't seem to think it was an issue for the 73+ disk brake cars.

I'll also add for the OP that you probably shouldn't raise the car higher than the original factory height. The suspension geometry for running radial tires gets worse as you add ride height, even the factory height isn't ideal for radials or a more modern alignment. The factory manual provides that measurement, "V&L" describes the factory A-body ride height. Most cars get lower over time, so more than likely your car is lower than the factory spec for height already.

factoryalignspecs.jpg