I didn't answer previously becuase I wanted to see what someone else would say to this.
My opinion is that they both can be set-up to work pretty good. They both will require some tweeking and tuning to work best. Setting pre-laod with CalTracs can get a little tricky. If you buy ladder bars do not buy the cheapest. At least get the adjustable bars so you can set pinion angle.
I will give a huge edge to the CalTrac if it is street driven. It will make a little noise but that is the only negative.
In my opinion if you are stuck with leaf springs do the mono=leafs only. Mulit-leafs are too stiff for a drag car no matter wht you read in magazines.
Ed