Nothing wrong with a straight axle. Actually, there are many ways to improve on the design.

I didn't want to go too far on the subject as it not within the theme of this forum.

But how a person wants an older application to conform and ride/handle to modern specs is a personal choice as to how the car is used and how far you want to make alterations.

Radial Tuning is a complex subject, especially for a fifties/sixties car.

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Gives me something to think about too. Everything I wanted to know about modern tires on our classic vehicles but didn't know how to ask. My truck has a straight axle but I don't think that's all bad. Later I'd like to ask some questions regarding leaf springs.  Thanks for the link....

64F100 57FAIRLANE500

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Very interesting. Gives me something to think about.

SE Wis

That control arm shown is for a circle or road race application ($$$). I just used it as an example.

If I had a 55/56, I would modify the upper control arm mounting bracket to simulate how the later MUST II adjustment method was done if not wanting to go full MUST II changeover with rack. That design used no shims - 

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I do have an idea on how to modify the mount but now after seeing that adjustable upper control arm it would give more adjustability. 

SE Wis

FORD went to radial tires (optional) on the 1967 year model run. Front end design was changed at that point to accept adjustments necessary for the radial tire, also known as RADIAL TUNED.

Previous model years cannot accept the needed radial tire CASTER figures as the now needed adjustment range was not necessary.

Excessive shim packs are dangerous and prone to fall out. 

The only alternatives (IMO) is either re-designed the control arm mount or going to an adjustable control arm.

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I've also been trying to figure out how to obtain more positive caster on my 56 Victoria. Using an angle finder it looks like the upper control arm would need to be moved rearward about 1/2" to gain about 3 degrees or 1" for 6 degrees. Any suggestions 

SE Wis

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I think that is what I was looking for. Thank you.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire