finding tdc before removing is so the rockers don't force the cover off in case you have 1 bolt in a corner that may bend the cover.

now that you have it off, just check the flatness of the mating surface.

and I hope you'll review the how-to's in the tech section before you try to assemble.

thanks to the both of you the forum on how to find tdc really helped alot

They're usually the two bolts just inside the covers you take off for valve adjustment.