The only mark for TDC is on the outside edge of the flywheel. It is viewed, as others have described, through the handhole on the underside of the forward end of the torque tube/bell housing. It is often, if not usually obscured under the scale of rust and general crud, enough of each or either or both that it can be difficult to find. It is there.
It consists of nothing more than a shallow line running fore and aft on the outer surface of the flywheel, and marked TC/1-4. If you get either # 1 or #4 as close as you can to top center as viewed through the spark plug hole, some scouring with a brush and solvents (nasty work, as you have to be under the brush to see what you're doing) will usually reveal it.
That mark indexes with a mark on the lower flywheel cover that bolts to the lower half of the front of the torque tube, the half moon below the motor. If that piece is cast, there will be a nub cast into the inside for alignment. If it is stamped, the vertical line/impression stamped into it is your index.
If you absolutely can't find that mark, there are elaborate and simple ways to set valves. For the most part, you can watch each pair of valves as you turn the motor. The exhaust valve will close and then the intake valve will openand close. Turn the motor about 45 degrees beyond where the intake valve finishes closing and you'll be on the low part (flat) of the cam, and safe to set the clearance for both valves on that cylinder. It will save a lot of chasing around if you keep your firing order, 1-3-4-2, in mind but, bottom line, whatever cylinder you're on, watch for each exhaust valve to close followed by the intake valve opening and closing, and take them one at a time in whatever order works for you.
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