Yes, I know a guy who installed mechanical linkage in an MCSS with an LT1 T56 and LT1 bellhousing. The ballstud for the fork is not in the right place for proper mechanical geometry, so the pedal was extremely hard, so he did not keep it.
The guy went by the name "Crazy Bill"; so you may know him from other boards/lists. He has since died, so there is no way to follow up.
I would think to do it properly, the fork ballstud would need to be located in the same location as any other GM mechanical linkage. Of course, this would require some fabrication. With enough patience, I am sure a kit could be designed.