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I know what Fleetwin is saying and totally agree with him, about reverse supercession. However, in this particular case, it would SEEM TO ME, that those pistons and rings would work. One stupid question, though…You do have the pistons in the block the right way, in the picture, but that is not a picture of the final installation, because BOTH pistons are at the tops of the bores….
As for your ignition wires, it may be tricky to see, but the forward-most ignition coil is the top cylinder and the rear-most coil is the bottom cylinder. If you are careful, you should be able to trace the wires without taking anything apart.
An actual compression test, with readings, would be good to know, before you go down the wrong path.
Putting a small amount of fuel/oil mix in the cylinders and seeing if it fires, like Buc and Fleetwin say, is a good idea. If it does fire, then try squirting some directly into the bore of the carb and see if it again fires briefly. If it fires with fuel directly in the cylinders but NOT in the carb, then you may have sealing issues with the crank case or reed valve issues. But one step at a time.
Long live American manufacturing!