Mark's response to the bearing question was this.
"The shells get thicker as the undersize gets greater". If anything that should make it more stable than a smaller undersize bearing. After break in, I wonder how high I could rev this 358? It will probably be done at 5500 rpm, so probably setting my rev limiter on the Ignitor 3 module at 5500 rpm. With the much stronger light pistons, stiffer plus lighter and way stronger rods with ARP 2000 rod bolts and ARP main studs with a 330 forged crank, 7000 rpm should be easy peasy. I know a guy doing that with heavy Speedpro's and stock rods, running low 11's with his Olds 350. That should mean 9000 rpm should be possible, I don't have the guts for that.