Being that you are using a "truck" motor too, I would assume you would have the same issue as I did, I just went to the local GM dealer and went to the parts dept and told them what i had, they gave me the smaller bering that sits further in the back of the crank, using the larger bering would have caused there to be about a one inch gap between the back of the block and the face of the bell housing. You may need to use a spacer and longer dowell pins like i did, and then ANOTHER spacer for the throw out berring. Then again the issues Ive had may be unique to me because Im using a newer 2007 6.2ltr Escalade bottom end and an older T56, the newer cranks may just be different than the earlier LS based motors.
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