Will GM 200r4 work with factory floor shift location?

This is why when I worked in the converter industry, we custom built converters for such applications.

Right now the only thing that is supporting the converter in the front is the flex plate, and they call them a flex plate for a good reason.

From everything I've been told from people a lot smarter than me, the converter MUST engage the hole in the crank.

A quick question. Is the hole in the adapter the same size as the crank pilot?

Another question. Is the transmission bolted up to the engine as it would be in your car? If it is, there should be no clearance as your photos indicate between the mount pad of the converter and the flex plate.