will 17"x8" rims fit a 67 cuda ?

OK meangreen it's not quite that simple.Are the wheels/tires you are talking about only going on the rear?If so they should work BUT using adapters is never good.For safety reasons you never want to use adapters on the front steer tires.The stock size tire for these cars is about 26 inches tall and you can go about 10 inches wide on the rear.I had 245 40 18's on mine and they never rubbed.