However I am worried that just putting them in the rear would change the angle at the transmission yoke and rear end yoke, and thus give me problems at the u-Joints and vibriation
Jim,
Thanks, The stock rims were ONLY for that picture (they rub the disc brake calipers otherwise). I picked up the wheels for my project car, but the paint matched my convertible...
The front springs are Hotchkis (1"-lower for Big Blocks). I thought the rear were Hotchkis too, but my reciept only showed the fronts (I got these about 8 years ago, and thought I bought them at the same time)...
raising and lowering the springs slightly shouldn't have too much impact to the critical yoke angles (transmission roughly parallel to the rear end yoke)... Best way to address this would probably be adjustible upper control arms in the rear (Edelbrock or Currie would be my choice)...
Naturally, as your old springs settle over the years, the driveline angle will change, but shims are not necessary because its not that significant of a change...