If these are track only tires, don't bother! Get a set of ET Street's (bias ply's) instead, you already have the rear end for it! It's still a DOT tire so you can use it in most street legal drags. You'll be able to shock the tires and get out of the hole ALOT faster with a bias ply, and they require way less heat and burnout to hookup.
im just about to replace my 315's mickey's DR, and while they were soft (like an eraser on a pencil) I was some what dispointed, for the price I paid I still couldn't hook like I wanted to even with them aired down. and with only 1 trip to the strip and spirited weekend driving they only lasted about 3 months.
but it was cool to tell the guys I got MT in the rear.