I believe the v6 has better ratios but you need the correct bell housing to go the engine. To be honest a normal ratio box is just fine. 1st is short but its only used briefly anyway. As for a diff, bigger ratio gives better acceleration at expense of top speed.
Just get your cat built. You can swap parts later, once its on the road and you have an idea how your car drives and how you'd like to change it.
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