Lunati cam too much for a 318?

Well, you could do what I did; build the engine the way you think you want it to be.Then just keep throwing stuff at it until something sticks. It get's a bit expensive, and the parts pile up on the shelf, but in the end, you get a dynomite package.
Start with the 2500 and 3.91s, and skinny street tires;it will be fine.