QA1........................no comment. Well, you will not find them under too many real fast cars, that is about all I can say
Coil overs are not needed, they are a nice addition, but certainly not needed. Call up Todd at TRZ Motorsports. He has a selection of MOOG front springs that he can set you up with depending on the front weight of the car. They are a ton cheaper than the coil over setups and you will not have to have special control arms to use them successfully (and yes I know you can use the QA1 with a stock lower control arm, but they are not designed to carry the full front weight of the car where the shock mounts).
With that amount of power you are really going to need things to be spot on and your converter selection will need to be perfect as well. That kind of power and all of that weight is going to be a challenge, but you can make it happen with the right parts and some tuning. Dont get rid of that rear end! The mounting points for the control arms is in a really good location. You will want to lower the back of the car down until the lower control arm is parallel to the ground. In fact, you may even get the arm pointed down at the ground (higher at the rear end) then use the brackets like BMR sells to relocate the back of the rear control arms to get them level again (their design has the most adjustment holes and has a hole that is about an inch down from the factory location unlike other brands). Start saving for some double adjustable Strange shocks for all four corners. With them you can control the suspension and make the car work.