I did the coil-over conversion which took most of a full day last Friday as I had to remove the lower control arms and the 1" sway bar, wheels to have access to R&R the lower and upper mounts, etc. It was a pain in the Ass but I got it done with two floor jacks a pair of "Race Ramps" 4 jack stands.
Anyway.. I did end up using the 150 lb spring that came with the kit after talking to some other owner of this same car/set up and with the tech. rep at "Competition Engineering" the makers of this kit. I have a set of 275s that I was going to use but am now glad I did not.
I drove the car to show it in the "Hot August Niles" car show in Fremont this past Saturday and there were several different road conditions including some really bad road in a few places and lots of uneven roads and dips, etc. About 75 miles each way. The car handled very well on all of it. The ride quality was hugely improved, and there was no hint of any bottoming out at all. The car is like a completely new car now and it feels totally different than before and handles much better in all ways. So the opperation was a success and this post is just to thank everyone for your input and to let anyone interested know the outcome.
Warmest regards to all! Don