Which tranny should I go with?

[84_GT350]

700hp is a MAX estimate. I just want to be on the safe side. I expect the motor (in EFI trim) to make about 450hp or so and then maybe another 100hp shot of N2O. 450hp isn't too much for a street car...and the car won't be totally N/A anyhow. The reason I say 700hp is just to add a margin of safety. But the max I expect to be putting down is about 550hp.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

So I pushed it up to 110,
That flathead motor was about to give in,
I crossed my fingers and prayed to the lord,
Don't let me down you fuct up ford!"

"5-Oh Ford" by The Reverend Horton Heat