Help with control arms??

Chances are that your quads are already shot anyways... Take them off and drive the car around. If you experience wheel hop than save up some money for some new rear LCA's.

The widest tire most people can fit is 275 without very much hammer work to the fender
 
You can try flipping your Quads for a little extra clearance. All cars react different, some guys can get away without using them after they replace the LCAs and others cannot.
 
being able to ditch the quads is not a 100% given. sometimes you'll still get wheel hop.

be VERY careful of lower control arm selection on a street driven car. Rear control arms with polyeurothane bushings on BOTH ends will bind and destroy your torque box's. They don't work well at all with cornering. If you have a street car, it's essential to get one with a spherical bushing at one end, and a polyeurothane bushing at the other end. This will prevent bind around corners. maximum motorsports make a great arm like this. I run the pro3i arms from stangnets partsshopper. they're nearly identical to the max motorsports pieces but cheaper.