Adjusting Timing Chain - Help Needed PLZ

[vutony]

To make a long story short, the silver marks on my timing chain is not lined up with the stamped marks on the cam gears and crankand safe way to put in back to the fsm spec. I know that the right way is basically stripping the motor (removing head, intake n exhaust mani, etc.) but i dont want to do this if its a must. I was thinking that i can remove oil pan (drain oil of course), strainer, belts, crank pulley and front oil cover/pump then re-align chain BUT having some doubts that the headgasket will be damage.

Any inputs will be appreciated, thanks in advance.