Tire sizes for 18's on a '70 RR

[SRT-440]

I'm getting 18x8 F with 4.5' bs, and 18x9.5 R with 5' bs. I'm gonna go with Nitto 555's on the front and 555R (drag radials) on the rear of my '70 Roadrunner.
What size tire will work best for front and back? I was told a 285/40/18 would fit the rear and I do have the inner lip rolled for more room but stock spring location.

Thanks! 

[Rolling_Thunder]

i believe nitto makes a 245/40/18 = would be good for the front -  285/40/18 for the rear....