Will Boss 338 (18x8/18x9.5) fit on my 69 cuda?

I have the 18x8's all the way around. I originally wanted the 18x9.5's in the rear but they were really close to the lip and I would have had to raise the rear up to clear.

What exact tire size and backspacing/offset doe you have front and rear?

What's the distance from the tops of you wheel lips to the ground front and rear?

I'm trying to fit 17x9 with 275/40/17 tires on very soon. I know the front bottom edge of the front fender lip needs to be moved out/cut/bent 1.5-2"x3" triangle. We'll see what else it needs. I'm sure over 5.0" backspacing. My rear wheel lips are rolled allready.