Gus, seeing the squared off tops on the "3" in your photos had me looking again. It's the rotten blurred camera shot on mine that made the 3's look rounded topped and smaller. The "335" is clear, crisp, and in-line with the 1108. I also could see a "7 M" before the manifold got in the way. I suspect that means December '67 date code? Should be about right for a 4th week January vehicle.

Also, looking at the parts catalog page and date code, your 400HO may be a '63 starter.