Cam timing can be ruffly checked by looking at the two cam lobes for one cylinder. When they are both at the top of there lifter lift(nose on top), that same piston should also be at the top of its stroke.
I.e., the two valves for that cylinder will be changing from exhaust to intake as the piston reaches TDC.
It would be easier to watch the lifter for any given cylinder for this test if you want to put them back in.
