'69 Dart rear suspension kit questions (RMS and ControlFreak)

Have you looked at Unlawful Racing.com, I made my own but based the design on there system.

That's an AMAZING system they got there on the site...

I actually looked into Hotchkis' kits for the Dart and for around $3500 I can get front and rear parts, but the rear is still a leaf spring set up. for about $500 more I could get that beastly system there!

My only question is that it says "A body with stock gas tank removed". I'll be dropping a different tank in there anyway, half in the trunk, half through the floor because I want to keep the factory fuel door location, and maybe go with a 20 gallon tank. Not sure exactly yet, but I'd like to get some more feedback on that Unlawful Racing system!