They do hammer, i made 430rwkw with mine. However that was with a motor and mods to handle it.
A 35R making 250rwkw is going to be laggy.
A 35R making 450rwkw is an absolute response monster.
RB26 and NEO RB25DET rods are the same.
Definitely throw some forged pistons in there while you have the motor apart, get the rods resized, everything balanced and away you go.