check vfaq.com or get a manual helps a lot.

first make sure all marks are aligned, get a timing light, then ground it, have the light flashing at the markings for tdc and such, adjust the cas till it hits tdc or depending on the degress you want it to be at

alright i got a manual and i no the about the tdc and all i just dont no about to cam gears

What don't you know about the cam sprockets? Are they aftermarket gears or something?

If they're the originals, they should each have a mark etched into the edge near the teeth, it's often highlighted in white (I highlighted it in red for the picture).



EDIT: didn't realize you had a 420A motor. Regardless, the cams will line up in a similar manner.

In the future, I would recommend you post your questions here to avoid confusion: 420A DSM Tech - DSM Forums