First step to restoring my 1974 Duster; Front End rebuild (coilovers needed?)

16,000 miles on my urethane strut rod bushings with no problems but you say they are bad??

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Limiting suspension movement?

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Maybe if I had pencil thin torsion bars and worn out shocks, that would be a problem.
I don't.
The OPs desire for the 1.03 torsion bars and Bilstein shocks would mean that the range of suspension travel in normal driving will be reduced anyway.
Some people drive a worn out Mopar and think that they have to reinvent the wheel to get it to drive right. I don't agree with that. I see some products advertised that look and perform nice but are often not needed....especially when the owner just wants a fun, safe cruiser.
Urethane strut rod bushings in a car that also has bigger torsion bars and better shocks are not a problem. I will agree that adjustable strut rods would allow more free movement but is the cost worth it? What gains are you getting for that money? It may not be any faster ,more stable, comfortable or quieter. Some tout the increased caster you can get but that is at the expense of increased lower control arm bushing wear due to distortion of that bushing from the strut rod pulling the LCA forward and out of square.
There comes a point where you are spending money for parts that provide no measurable benefit. Some call that the point of diminishing returns.