I think I'll have upwards of 450 HP.
Late model hyd roller blocks ................Keep the RPMs down............... If not abused , it will work fine.
Randy has provided very sage advice, and I agree, but would like to add an emphasis on the "if not abused" part of the statement, as although in instances these blocks have been pushed to this level, and even beyond it for many, but understand for some others, the results,........well.........not so good.
Do understand that these O.E.M. blocks were not truly engineered to tolerate such loads, and although as we have practiced in the performance world since its' inception, we push the envelope until realizing failures, that at an unacceptable rate, and then will draw a new line in the sand as to where 'WE' think the components are suitable; but understand that this line is not as definitive as one may often think, and failures, though they should not be necessarily unexpected, are surely unappreciated.
Please realize that my perspective is one of a person who is not a real mechanical engineer, and probably suffers from trying to over-build anything I come into contact with; as if the sum of the metal in the structure can be made greater or there is room for one more bolt or just a larger one, then why not mentality. But ya-know, the guys in battle, in the tank with the most steel armor between them and the munitions being thrust in their direction, usually feel more comfortable and generally will experience better results in survivability
Scott.