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Assumptions have to be made to answer... based on what you have..
1) If your desire is that you will use the car mostly local and to go have fun.... 454 with 4 Speed... nothing more fun to drive on the street then torque. (assuming you have the springs and everything to put in BB and manual)
2) If you desire to road tripping... SB and 700R4.
3) If you desire to roam the local streets and road trip with an attitude ... BB with 4 speed and GV overdrive...