hey im a proffessional toyota mechanic and if you are going to so that job you might want to have the CAM seals and timing belt w/tensioner done as well. only because if those parts go bad later you will have to pay for labor again so it makes sense to get it done at one time. also make sure your water pump its not leaking if it is replace it, if not than i would leave it alone. i would love to do this job but can't really take on any more jobs right now. you should check this guys out they're members here i saw a post of a job they did a while back. go to automodz.net