Learned a new trick today for finding true top dead center. This may be the half assed way but from what I have been told at least it gets you close.
pull all 4 plugs (in case of kickback), wrench the crank clockwise until you are at 0 on the oil pump. Now put a pencil in the 1st cylinder and slowly turn the crank clockwise until the piston touches the pencil, STOP and mark the oil pump where the notch lines up. Now rotate clockwise very slowly until the split second the pencil does not move, STOP and mark where the pulley notch is. Next step is to split the difference between those two notches!
This gets you redneck close to true TDC. If you are not super OCD and don't own a cam degreeing kit this method will get you in the zone.