I'm just looking at changing a few pulleys on a yb I've just purchased including the cam pulleys. The engine is Newley built with new cam belt but I want to know if I can lock the cams, crank etc or mark them somehow so that when I take the belt off I can change the pulleys without knocking the timing out??

I will be having the engine fully checked out when it's back in the car as it will be going to my local rs garage to have all the final checks and little bits done.