make sure those clevite bearings are up for the added HP...
I recently read they have some better P-series bearings from Clevite, wich cope with the stress a little better than the regular ones...haven't got a clue on the pricing though...

Maybe a girdle for the bottom-end will help keeping things together?

just a thought...
(yeah, okay, so I think a lot...not everything makes sense...so if it's a lot, there's bound to be one or two good and usable thoughts there, wouldn't you agree?)