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My FSM calls it out as a bearing, however the OEM crank bearing looks to be a bronze bushing. Picture below:
That is the GM fluted bronze bushing, which I believe they call "oilite" because it's self-lubricating. The part # is CT1088. This is what seems to have come stock in the LT1 and LT4. I'm no expert, but this is what was recommended to me by Jim Jandik of PowerTorque Solutions, one of two ZF/clutch gurus. I know the previous owner of my car had installed a roller bearing instead, and it came out in pieces. That's just one case rather than a body of proof, of course. But your bearing still looks great so I see no reason to go with anything different.
If you do go with a bushing make sure it's a good one. A magnet should not stick to it. A lot of cheap bearings have a high iron content that will wear your input shaft.