Thanks for the advice, guys. I also found out that this was originally a 318 car. Should I have him purchase a set of big block torsion bars for it also? He isn't complaining about bottoming out, but I don't know if I should change them to balance out the suspension.
The Hotchkis kit uses 1.10 torsion bars
http://www.hotchkis.net/product/41-in-1-03-in-forged-torsion-bars-for-mopar-b-and-e-body-models/They may have actually use 1.03 bars now? It's different on the website.
I use 1.12 TB's from Firm Feel