Depends on what you want. Do you want easy (4g63), or to you want more power, and loads more torque? (4g64t) 's up to you. Lots of ways to approach this one. Pros and cons on both sides, all told, they come out about neck and neck. But, you can take the '64 higher in hp than you can the '63 and the '64 will have more torque.
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