R and P ? best tire size

thanks, the 27s i was looking at has 11.3 inches of rubber on the street, rear is getting a mini tub next week with leaf relo. to the frame rail, drive shaft length will remane the same, i considered moving the leaf center back 1 in. but a custom drive shaft was not something i want to deal with financialy..

SOOOO... the 27s and 4.11s or 3.90s ??? ( i dont believe i can go taller than 27 with out cutting the front of the rear fender which is not something i want to do)