even a bolt in cage will help and I recommend it for that reason. You should also get some torque box reinforcements or you'll eventually severly damage your control arm mounting points. A set of adjustable shocks and struts will help your launches by helping your car transfer weight efficiently when adjusted for drag duty and they'll help the handling for street duty by setting them to a correct street setting. You should also look for an airbag to go inside the passenger rear spring (I think that comes with the drag launch springs).
You're eventually going to pop your intake with that 150 wet shot in all probability. Consider an HPS Hardball'r intake (
www.hiperformancesolutions.com). It'll take a nitrous backfire according to the maker. I'd be real worried in general about blowing the tires off and subsequently smoking the motor with such a large shot of nitrous on an unprepared engine. Your call but it's free advice. I'd limit the shots to 100-125, up the injector size, and keep the fuel jet from a 100hp shot. Make sure you get a dyno tune for the 100+shots. You really need to keep the AF good when the shots get big or you'll risk major engine damage.