You are going to get what you pay for. Stay away from the el cheapo kits. Lots of choices, Jegs, TCI, but B&M is probably the best. That is what I used. Just be sure it is a COMPLETE kit. Are you going for it? Read the FSM, and any other T-400 specific books you can find. I needed three different manuals to cover it all, each seemed like it left some stuff out. I did it with basic hand tools and feeler gauges, but I as poor then. Now I have better tools. And of course, workplace cleanliness is the most important thing. And when you remove the valve body, take note of the position of all the check balls and write it down, or you will absolutely forget where they go.