I have a 74 4spd Formula and the disk is the same size as the 400. Difference is that the 350 Formula has a Saginaw transmission, and the 400 came with Muncie transmissions. All 455's had 11 inch clutch units and the 350 and the 400 had the 10.4. The spline count is what you need to know when you order the clutch.
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