Has anyone ever increased the size of the retainer hole on a 67 A833 trans #2780512 to accept a 68 A833 4speed that has the larger diameter retainer? I have my 67 Hemi with the 172 tooth flywheel and the correct A833 bellhousing #2785012, 3.834" diameter retaining hole. The transmission I have is a 68 4 speed A833 which has a larger retainer, 4.494". I thought I could use a 68 Bellhousing, with a standard starter but that won't work with my 172 tooth flywheel, which requires the direct drive starter, which I also have. See photos any input is appreciated.