Hmm, so it's neither the carbs nor the timing... seems like that means that it's an electrical issue then, otherwise it could be a problem with the engine itself
First thing I would do is hook up a timing light anyway, then rotate the crank by hand until the light fires. On mine, the left would fire about 30 degrees before the timing arm reached the top of the timing mechanism when I used it in this manner, so that's what I expect you to see as well. Pay attention to the rotor after the light fires; the "LF" mark should then come around the next time the timing mechanism looks like your last pic. If not, then I would think that the PO wired the coils wrong at some point and they just need to be swapped. It may be unlikely, but it's better than having to replace the coils or the ignition module, and definitely better then opening her up even more (remember: Optimism).