Barracuda Ride Height?

I have 18X11 Rims with 315/30/18 tires. Tires are only 25.5" diameter. Wish I had gotten something a little taller to fill the wheel well more. But it appears I am stuck with those as I can't find a taller 18" tire in that width.

I did minitub the rears and have a Reilly Motorsports 4 Link rear