Precision PT6262CEA ball bearing should get you there.
http://www.precisionturbo.net/Street...PT6262-CEA/245
Sadly dont think there are any UK stockists. Price above is for their oil journal unit, BB is extra $600
Either way, great value units.
Generally if you want to make xyz bhp, then you will need a blower capable of a bit more to actually allow you to make the power without having to ring the absolute life out of it.