A-body Hemi box 4 speed

It was a common thing for a guy with a Camero to hack the input shaft on a transmission like what you have so it could be bolted behind a healthy rat motor. They were also good at modifying the Mopar Dana 60s for their other than Mopar race cars.
Everyone knew these type of parts were the strongest parts one could get at lower used parts prices. Even the brand x guys.
In the past 30 some years I have repaired many such butchered transmissions.
Some were slick shifted some not. Some long tail some short. They weren't picky as to a certain configuration. But the one consistensy was the shortened input. It was necessary.
They made a plate that bolted to the back of the bell housing to convert to the 833 transmissions bolt pattern. The thickness of this plate and the pilot used would determine how much was cut off the input shaft. It varies from one to the next.
I have only seen one that was done well or in a lathe. I have even seen them done with a torch and file.
Most are ugly work that I have come across.
I would fix the input and get the correct linkage on it so it can be used in a A-body.
Shame to leave it yuk'd up like that.