Holy shit man. Fucking sucks about your last car. Cams on the mod motors are expensive as hell. Theyll give you pretty good gains but it doesnt justify the price until you have most of the other bolt ons. Any reputable supercharger company can get you a reliable kit. If your gonna go with a centri then I would get one thats self contained so its less of a hassle and you dont have to worry about running oil lines from your pan. Kenne Bell positive displacement blowers work pretty well too. I would see if you could find someone with similar mods that your looking for and see if you can get a ride. Its a whole different world from the rice. Here, you just hit the gas and regardless of RPM the ride takes off like a bat out of hell. At least the supercharged ones. Mod motors are known for their lack of low RPM grunt. I went from a mild 5.0 with probably 200-220 hp or so and it felt quite a bit stronger in lower rpms than my current 260hp GT. I also had 3.55 gears in it though. First choice for mods though on a 99-04 GT that will get you the best seat of the pants though is swapping the rear ends gears out for something in the range of 3.73's to 4.10's. Hope this helps.