Tubbing a 68

[RdHuggr68]

I just joined Lateral-G I own a 68 Camaro and have a Hotchkis TVS suspension system, Cal Tracs traction bars and Baer disc brakes on all 4's. We are presently removing the body to replace the floor pan and I was thinking about Detroit Speeds Mini Tubs so I can put a larger tire on the back. I called Detroit Speed and they said you have to buy the kit for shock and leaf spring location, also the gas tank would need to be replaced. Not wanting to break the bank is there anyone out there that makes a different kit for tubbing your car for a little less cash. Any help will be appreciated.