I don't think it's the cheapest route, but definitely one of the best. The 200r4 from a Grand National would the best to get. In stock form it will handle your motor just fine and when built right it will handle alot more than you could throw at it. The cheapest route would be to switch to a taller gear (lower numerically).
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd
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