Don't know about resizing, I sure as hell ain't going that far I'll promise you that! Lol
As for the bearings, it's been pretty well documented that they can last for a ton of miles. I have done a fair amount of reading on this subject, and overall the consensus is just leave them be unless they look all beat up. As this isn't going to be a daily, the amount of millage they will see will be significantly less. And if they do get replaced, it will be with factory GM ones as the aftermarket options have different metallurgy voodoo going on that doesn't last as well as OEM, and can prematurely wear out camshafts.
I will do my due diligence on replacing them, but it is not something I'm going to go out of the way to do if the don't HAVE to be replaced.
And hey, if the motor piles up later, seams like a hell of an reason to stroke the thing. Lol