Backspace help

[rhinodoc]

I pulled the trigger andordered a set of bonspeed wheels for my 67 firebird. I need some help on the back spacing... I'm planning on running 18x9 up front and 18x10 in the back. I am in the process of putting a CA chassisworks g link with chassisworks mini tubs out back. I have a complete ridetech system with tru turn for the front. Any help, especially for the back would be greatly appreciated. I'm having trouble finding info with this setup out back.