How wide wheels will fit on my 70 challenger
 

Hi
I just bought a 1970 Challenger and I want to buy new 15 inch centerline
Wheels
Is there somebody who knows what size that would fit?
How mutch backspacing and how wide that fits on this car?
How wide tyres I can use?:)

For the wheels I have Front 18x8 +2mm (4.5 backspace) and Rear 18x9.5 -4mm (5.03 backspace)

Tires:
Front 245/40/18
Rear 285/40/18

For the Rear I still have 1" from the wheel well to the tire.

Hope this helps. See my profile for pictures, it might give you better view.