Since you asked, The CPP Mini-kit is a replacement Control arm kit for the 1st and 2nd gen Novas. The biggest benefit to this kit is when you replace the lower control arm. The early Nova lower control arm isn't necessarily a bad design (alot of manufacturers used the same basic design for years!) but it uses a single pivot point and is triangulated off the frame by use of a strut rod which runs forward to a point near the radiator. The CPP lower kit removes the factory lower control arm and strut and replaces them with a true "A" arm lower control arm. The new control arm gives you two attachment points and seems to do a much better job of supporting the front suspension. The CPP arms do a better job of maintaining suspension geometry by not letting the control arm move back and forth (the old strut was mounted in two large rubber bushings and they flexed a fair amount). You can get a complete kit from CPP which includes the upper arms, as well. These uppers replace the factory uppers which are actually pretty beefy from GM, so there's not alot to be gained (in my opinion) by switching them out.
I installed the CPP mini kit (lowers only) on my '63 three years ago and don't regret it for a minute. I saw no reason to switch the uppers as there was no real advantage for spending the extra bucks. Since the installation, I've had no issue holding alignment and I've won my class in autocross. It's the best money I've spent on my Nova, by FAR!
I hope this helped a bit.
Chuck