Then degree wheels and dial gauges are needed..
and a fixture to hold the dial gauges (indicators)
I made a post awhile back showing some of this
http://forums.pelicanparts.com/911-engine-rebuilding-forum/336439-cam-timing.html
fixture and dial gauges
degree wheel
Even if you could time the cams with the engine in the car... It would be easier to drop the engine and do it..