He is WAY more than one tooth off. As I have said more then once, watch the video!! The crank sprocket mark MUST be at 6 o'clock and the upper sprocket driven by the crank MUST have its marks at 12 o'clock. The chain that connects the two has 3 dark links, a single one and a double one. The single dark link MUST line up with the mark on the crank sprocket at 6 o'clock position and the double dark links MUST "straddle" the mark on the driven sprocket at the 12 o'clock position, see 19:15 in the video. Each chain going up to the heads also have a set of double dark links and one single dark link. The double dark links on each chain MUST be visible though the oval "windows" in the large crank driven sprocket, explained at 26:00 of the video, stop it at 27:12 to see this. The cam sprocket on the drivers side, or "L" has the letter L on it with a dot above the letter. The single dark link MUST line up with that dot, the dowel on the cam will be pretty much straight up in the 12 o'clock position, and the "V8" mark will be straight up also in the 12 o'clock position, start the video at 27:50 to see how this works. Pay attention to the part where the double marks have to be visible through the window in the large crank driven sprocket, they must be visible to get the single dark link in the proper position, see 29:17 in the video. At 32:25 the passenger side, "R" gets done just just like the drivers side, with the dark link lined up with the dot above the "R" on the sprocket and the V8 at the 12 o'clock position, the cam dowel has to be at the 12 o'clock position also, it's just like the drivers side. At 32:27 he explains with the diagram exactly the correlation between the double dark links visible through the large sprocket windows and the single dark link at the cam. The lighting is not perfect but if you freeze frame at 37:15 you can see each dark link on the cam sprockets and the double links on the large crank driven sprocket and how they are lined up. The only way this will happen is if ALL the links and marks are lined up exactly the way I and the video describe. Notice in the pic at 37:15 how much different the positions are from the pic posted, off way more than a tooth. The only way to fix it is to remove the chains and redo it making sure ALL the marks and links are lined up. Do that and I guarantee it will start up and run correctly if the rest of the engine is healthy. As stated the dark links themselves have no bearing on the timing. However they are there to ensure the rest of the components line up, if one of them is off even a tooth the whole system will be off. So while they don't actually have an effect after installation it is imperative to have them in exactly the right position DURING installation to get the timing right, that is exactly why they are there.
