The ultimate method of cam timing has to be a belt drive. Jesel manufactures this setup. And it’s top shelf when it comes to quality.  You have to ask yourself if you need this sort of cam timing arrangement on you car.  If it's a dedicated race piece, then it’s a huge bonus.  On the other hand, it might prove to be overkill for a street driven car (keep in mind the belt runs out in the open as shown here).