Originally Posted by
BRAMMER
The kit i have is Reyland but i didn't get the bell housing, but i'm sure once its all mocked up it will be fine
This is my box which once the slave is rested on touches the gearbox part so i'm not sure what benefit milling into to the housing would achieve

You will have tunnel clearance issues if you don't machine the belhousing, plus you're effectively altering the leverage by running the cyl further out.