I plan on swapping the following onto my "63 Dart. Any foreseeable problems"

Donor 1971 Valiant

8.75 rear axle, brakes, leaf springs and sway bar.

Front spindles and disc brakes, master cylinder and possibly the booster.

The sway bar may be too wide. You'll need to move the upper control arms with the spindles. You'll need to make up some custom brake lines for the master cylinder.

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Joshua

Josh, thanks for the info man. The brake lines I knew I would have to fabricate. Thanks for the tip on the upper control arms.
When you say sway bar are you referring to the front bar? I was talking about the rear bar. It has one.
I have an addco front bar I was going to try and use.

What about my driveshaft/u-joint situation going from the 7.25 to the 7.75?

The donor has a rear sway bar? Cool, that will fit. The front sway bars on the '67+ cars are wider than the earlier cars.

Driveshaft needs to be 2.25" shorter. When going from a 7 1/4 to an 8 3/4.

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Joshua

Thanks for the drive shaft info Josh.
Yes, a rear sway bar of undetermined origin.
Do I need a different u-joint as far as you know?

Rear U-joint should be the same unless the 3rd member has a large yoke for some reason.

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Joshua