Im building a new Gen 3 Circle track car and im really looking to do it right. We run a 6inch ride height and can not run aftermarket looking parts. Roll ceneter and Bump steer are my projects. Does anyone know of a roll center program that works with strut cars. The ones ive found all do just double aframe setups. Also any advice on either helps Thanks in advance

 

Can't help you with the program but what I can tell you is that thirdgens have an inclined roll axis and the front roll center drops below ground rather quickly when you lover the car.
If you want to stay stock looking you can either run a howe tall ball joint which is half inch taller. The only downside is that the ball joint doesnt look completely stock if you look at the cap on the bottom.
The other option is to run a balljoint from a mid 70s impala. Its 3/4" longer. It has the same size taper on the stud but the threaded portion is slightly larger. The two options for this is to just ream the spindle till it fits (negates some of the height gain) or just drill out the last 1/8th inch or so of the spindle so the threads can pass through. The downside is that you have less of the tapered portion in the spindle. I have not tried the impala joint, I am only relaying what my research turned up.
I ended up going with the howe balljoint since my car is street driven and I didn't want to take any chances.

For the rear, the roll center is the point on the panhard where the panhard bar crosses the centerline of the rear diff. I lowered mine approximately 4 inches to decrease the inclined roll axis. Jegster sells a bracket for the axle side that you weld in. I ended up ordering two of these and modifying one to mount on the chassis side. I do hear that Unbalanced engineering has a kit for both sides though if that is easier for you.
When you lower the rear panhard bar you will need more rear spring or swaybar to compensate. In my case I have moog 5664s with a half coil cut (should be low to mid 800s lb/inch) and I run a 250 lb inch rear spring. Sway bars are 34mm/21mm. The car handles magnificently for autocross type events though I would like to have a little less roll.

Good luck.