Why post when you dont know what you are saying? A C4 in a stock car huh? Please tell me why the hell he needs that? You can mod the aod with a lot less money than the c4 would cost and it will hold damn near 1000HP and still have OD so its friendly on the highway. And with no othe mods why would you suggest a TB or intakes? The heads aer going to restrict anything more than stock, and will probably lose some torque.swap that AOD for a C4
For the Cam.......this is like the 10,000th post this month on stock cars with BIG cams. You don't do a cam until you have done EVERYTHING else you are going to do. The cams in these cars are actually really good. I would put the 300 into exhaust, or gears (here comes the 3.73-4.10 debate), CAI, or start saving for a good top end kit like trick flow. Don't waste money on a TB or Intakes at this point, it will give you no seat of the pants HP, and actually will probably make the car more sluggish. You could also talk to silverfox here or on Click Click Racing about getting you a built VB (shift kit basically but done right) for harder shifting. With that and a set of gears then CAI and exhaust you will feel like you are driving a new car and will be your cheapest most seat of the pants feel mods.