Barracuda Wheels
someone makes support cross members for the 64-66 A bodied for guys that want to safely drive them with 300+ horsepower,but it has been a while, so my memory escapes me as to who it was.The lack of a second cutout for dual exhaust also hinders getting good exhaust,if you want to keep some semblance of originality. But brakes? there is no room for error when a person puts wide wheels on a nine inch brake. Increase in wheel Mass=Decrease in brake stopping ability.
Even a 10 inch, because eventually the larger wheel/tire combination will try to Influence the direction over the car, not the driver!Lol