Well with some of the higher lift cams you are required to use stiffer valvesprings. Its not the easiest of tasks to tear them out without a valvespring tool (although i did it with a C clamp and some big wrenches) But you could put a drop in cam in it, one that uses all your stock parts, aka a hotcam. I just happen to have one for sale if you would like to buy it. All you have to do is put this cam in and adjust your valves, there is already a near new cam bearing on it. So this is truely a drop in set-up. Heres my for sale post haha.