Thanks Firebuick & BillBoost....
Thanks Guys.. The upper intake manifold and gasket from the old engine have only been ran for 3 weeks. They were both replaced when the original UIM cracked/corroded/degraded and let antifreeze into the bottom end, ultimately leading to the bearing failure which submarined this motor. I think I'm safe to use this UIM again.
As for the lower gasket, I went ahead and unbolted the LIM .. already has an aluminum gasket. Looks like the replacement engines come with it now??