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I think you're good to go...
Pillowblock bearings seem legal to me.
As to something being wrong with ball bearing type, I don't know what you mean.
I would definitely get the self aligning type rather than the ones that hold the bearing rigid with respect to the mounting surface -- the spherical self-aligning features allow you to have the shafts mis-alligned a bit and not put too much stress back into the bearing.
Joe J.
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