In the big picture, I think you're going to find out that this is an exercise in frustration. The car is no lightweight and the motor is very small. The heads are only good for doorstops as you seem to have figured out already. The cam you're looking at is too big for 8.0 SCR. I'd bet the car will be slower with it than it was with the stock cam.
My best advice is to cut your losses where you are right now and drive the car as is until you either graduate or come into money.