I know what your doing and I respect it. I have a 68 Hemi Barracuda clone that I’m finishing up and it has a 4 speed.
Originally in those cars they used 1967 B body factory scatter shields and they had TONS of problems with clutch forks, Z bars and pivot brackets working together. Do yourself a huge favor and just run stock 1968 A body 383 shifter components and clutch linkage. Then use 1970 130 tooth flywheel and 10.5 clutch setup and aluminum bell housing. I know it’s not 100% correct but you will thank me in the long run.