I don't think that billet would be needed at those power levels. Unless you have the money and plan on making more power. There has been some talk of the 5r110 overdrive planetary being an upgrade over the stock one. Not real sure. Also cryogenic treatment has been talked about as well.
The billet input is relatively cheap, I'd just buy it and be done with it. Or you could buy a stock 5R input, I am pretty sure they have "metallurgical" upgrades. Stock 5R inputs put up with quite a bit.
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