You need to get a different output shaft cover, I had this same problem when I was putting a c-6 in my 65 Ford truck, because the factory driveshaft was a two piece unit with the carrier bearing, so I had to change from the flat flange type to the spline type, so I could run a one piece drive shaft. As far as the speedo cable goes, all you should need is a speedo gear for a c-6 tranny, and it should bolt up to your factory speedo cable, if not, you'll need to get a different cable for that transmission, hope this helps you,
Kenny
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