After a few blood sacrifices, bruises, and many cramps, I got the 190 into the bike frame. The top mounting tabs on the frame and the mounting... tube on the engine fit perfectly, however...
The rear mounting points didn't line up perfectly - the welds on one side on the frame were hitting the mounting points on the engine, so I ground that down as well as right in the middle of the rear mounting points on the engine, right where the two case halves meet (not shown in pics). The frame and the engine still didn't line up quite perfectly, but enough that a hammer would persuade it into place.
I didn't want to go out to the hardware store today - old man winter dropped a slushy mess 'round my parts over midnight, so I used washers instead of buying a spacer. I used this same method when I replaced the engine bolts on the 125 and both bolts stayed right in place.
One minor mod that is mandatory when swapping in a 190 is grinding, bending, or otherwise removing the rear brake return spring and mounting tab on the rear brake pedal arm. I just bent the top part of it off with pliers, but I still need to grind off a little bit more.
The clutch cable is a bit close to the engine mounting bolt, but I think it'll be fine.
The stock intake manifold for the 190 looks as if it was designed to have an injector in it. If you drill a hole in the center of the larger semi-circle, it will be pointed exactly at the intake valve and the smaller semi-circle on the flat could be drilled and tapped for a bolt to hold the injector in place.
I'm not sure if I'll try putting the injector directly in the intake manifold, I sincerely doubt I could drill perfectly perpendicular to a small flat spot like that. There is (at least) one metal-working shop in town that I could ask to drill a hole as-perpendicular-as-possible, but they mainly do welding and sheet metal work. I may ask them to weld in the o2 sensor bung instead of going to a muffler shop, it just seems like I would get a better quality weld going to a sheet metal specialist.
The stock mounting location for the spark coil isn't going to work, nor is the piece of metal it is bolted to. The 190 came with another spark coil with a different mounting scheme so I'm not too worried about that. I probably won't even use either of the spark coils that I have now in favor of a logic coil also called a smart coil. All I have to do with one of those is send it a logic-level high to start charging the coil and a logic-low signal to release the spark.
The weather delayed the aliexpress package until tomorrow.
I have a question for those who are reading this thread - what method of posting pictures do you prefer? IMG tags like I have been doing? attachments? text links? It seems like using IMG tags with large pics makes it difficult to read my posts.