727 Build for Mid-10s

mopowers said

I cleaned up the rusty input shaft best I could. Do you think this pitted area warrants swapping shafts with the other one I've got??? Will this hold up to 600-650 hp? Keep in mind the hub on the clean shaft has the messed up clutch splines. Is it worth swapping the good shaft with the good hub?

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That rusted shaft looks like it has a manufacturing flaw to me and it looks twisted.
I would not use it. Ideally another shaft would be best but if the choice is one of the two, I would use the one with the slight wear on the spline. It's not ideal but it probable will run fine. You could probably use a smooth honing stone and smooth down the marks or any burrs. IMHO