I have a 1964 Jan 6 build car 365 horsepower with a close ratio muncie. I understand that they were not termed M21 until 1966. What I am trying to figure out is whether I have the right tailshaft or not. It is a 429 but has a flat pad on the bottom versus a narrow rib. Does anyone know when the change was made in 1964?
Thanks
Dave
Thanks
Dave
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