McLeod's phone number is 714-630-2764. I have had very good experiences with them on both products and information. W/R/T a 4 speed in a 455, it will be fine until you put slicks on it. It is hard to get a 4 speed to hold up to the torque of a Pontiac for very long when you get good traction. In spite of that, it is all I will run on my GTO.
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Jim
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