hey guys! looking for some advice with my build! im in need of some new suspension parts, right now I have no modifications to the suspension. the engine is a 331 with around 400rwhp, and all it does is spin the tires. I have 235/60r15 et street radials but they will spin all the way to 45 mph+. Whats the widest tires I can get in the back with minor modifications ( rolling the fenders) with out tubbing the rear. Im looking to run a low 11 hopefully maybe a high 10 with the right suspension build. At the moment it is a street car but I don't drive it enough to care if the suspension is to rough. Im looking at caltracs at the moment because everyone says theyre magic but I wanna see what else is out there. The rear end is an 8.8 3.73 limited slip. Lastly, I wanna put a roll bar in so I can set up a 5 point seat harness with some race seats but don't know who sells a pre fabbed roll bar that needs to be just welded in, anyone know the best way to get one? and how much does it cost?