im putting my freshly ported head on my b16a. what problems might i run into besides making sure its at tdc before i start and making sure the cams are lined up, and cleaning off the old headgasket with a razorblade.

I made a mark at tdc on a tooth of the gear and the corresponding part on the belt, so it will line up exactly.I have never done this before so all help will be appreciated. oh yea, i have a helms.