Launching on slicks

Assuming you have stock 28-spline axles, slicks will twist them right in half at your horsepower level . At the very LEAST, pick up some 28-spline Mosiers with the stock posi and you will be OK but the best setup would be 31-Spline axles with a spool, locker, or good posi. This is also a good time to get your torque boxes and axles tubes welded so they don't start ripping apart. Do you have subframe connectors?

You have some cushion left to use up.

I have a couple dozen runs on BFG Drag Radials on my 7.5 in axle with nitrous. I have run 1.8 to 1.9 sixty foots and as quick as 7.80 or so in the eighth. It has an SVO traction lok, stock 1980 28 spline c clip axles, etc....

I have subframe connectors, boxed upper and lower control arms, and still have the rubber bushings in there. This is with an automatic car.

With some testing, you should be able to safely get the sixty foots down to the 1.8 range.

All that said, I have an 8.8 already set up, and am planning on welding up the torque boxes, and getting 31 spline stuff as soon as possible.

If it were mine, I'd definitly upgrade to 31 spline hardened axles and an aftermarket posi carrier...450 rwhp is nothing to mess around with.