Will a Stock 489 handle 700hp?

I'm planning on running the following set up:

408 High Performance BluePrint Engine
727 Race Trans
Manual forward shift TCI
8-3/4 Race 489 w/3:23's Duchman race axles
I believe the tires are 235/50 series race radials.

Plus, I am experimenting with a proto that increases low end torque significantly. I mean significantly.

I was expecting not to have 700 on the top, but a lot on the low end which is harder on the diff than the 700 at the top. I have never heard of a diff breaking at the top, though I am sure it has happened, most of them break on the low end/take off.

The 3:23's are for highway, this is a street strip car and the mileage is 8-9 w/o the proto on it. I can't go to 6-7 with race gears. I don't plan on racing it every weekend, but I need to prove that it decreases et's by so much. I plan on putting it on a chassis dyno. I don't know if I should keep it off the track and just do the chassis dyno with a professional tuning the timing/carb before and after the proto or if I will really need the et difference to sell it to racers.

I am really good at vaporizing fuel, but I am not as familiar with all the ins and outs of racing parts, and how increasing the low end torque will affect the engine and drive train.