I'd like to buy an aftermarket set of heads and a more aggressive cam in an effort to pick up around 50 hp. I'd like to do an intake also, but to keep costs down I'm going to start at the bottom and work my way up. My question is, how difficult of a job is it to install the heads, rockers and cam? I am somewhat mechanically inclined I'd like to think. I installed my exhaust system myself as well as shocks, struts and springs. If i followed a manual, could it be done easily, or am i better off forking out the coupla hundred bucks to have a garage do it? Does a 40 to 50 hp gain sound reasonable given the small amount of mods I have now?