[Liltroy]

I've replaced plenty of spun rod and main bearings with no issues after. Heck, I once replaced three spun rod bearings in a 400 pontiac while it was in the car and my buddy drove it for almost 10,000 miles before selling it. Although I could see your concern with a spun cam bearing since they're completely round with no tabs like a rod or main bearing. I've never had a spun cam bearing though, only severely worn ones that I've replaced so I guess thats why I've never had any issues with replacement. But for $300 for a new block with bearing already installed,and since you're rebuilding it anyway, Id probably go that route as well.