I just bought a 68 convertible. It has 7" rally's wheels and p235/60r15 tires. I want to put American torque thrust Can anyone advise me what model ar wheel? And should I st at with 7"rims? I plan to keep these tires. Since I am I assume the 7" way to go. What backspace? What offset? Should I go with tt2. For the brake caliper? cl205?