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Not the answer the OP is probably looking for, but at that level of power, 900 ft/lbs, ditch the 727 grenade and move to a PowerGlide or prepped Turbo 400.

At 900 ft/lbs you should be able to accelerate just fine without the added gear reduction.



You don't think a powerglide or a turbo 400 won't blow up ?

Cummins powered rams putting out over 1500 ft/lbs use a 727 based OD trans and don't blow up when built properly .