Stepside....you should have NO problem getting into the 12's with your combo....getting it to hook is going to be the key. I know of many guys with similar combo's running low 12's, even into the 11's, and no NOS either. It's pretty easy with a big block. Getting the power to the ground is not so easy. You'll have to mess with suspension, and use sticky tires...but otherwise it should be and easy goal. I have to disagree with the exhaust question though...I would not go with 2 1/2"....more cubes like to breathe, and the 3" will help with that. If you're looking for 1/4 mile times, you will want the larger system eventually. If you're strictly talking street and short blasts light to light, the smaller one is fine. Im sure there will be differing opinions. John