Great thread...outstanding detail on the build. As a Nova guy I think it is very cool.
Regarding the rear springs...have you considered using the "Dick Harrell Style" spring clamps??? They worked really well...and eliminated the need for traditional traction bars. They were cheap and easy to fabricate...and the results were very good.
old thread where this is discussed along with other stuff...
https://www.yenko.net/forum/showthread.php?t=71829
-wilma