You won't be dissapointed with the Koni Classic's with your Hotchkis springs. If you are using your stock mono-spring shock plates then get the 1915's and add a shock extender to make up the difference between a single leaf and the 3 leaf springs. The 3 leaf stack isn't as tall as a 5 leaf so you might get away without the extender... If you mount the upper shock mount with the suspension hanging under the car, the shock should be about 1-2" short of fitting on when fully extended, any more than that and you should use an extender.
If you can find non-staggered multi-leaf shock plates then use the 1953's...