Not meaning to offend here..
But they were meaning the N1 block isn't worth buying over a normal rb26 block if applying your head..Or the 26 bottom being of any advantage. The cost far outweighs any gain ( there won't be ) over a 25 or 30 bottom end, which you can still put all your HIGH quality brand crank, pistons etc into.. Seems you are also money conscious, so forget about the N1 block, and spend the money elsewhere.. The block itself will not make the motor any better in your case.
Also standard rb30 crankshafts have produced over 1000hp, therefore not requiring aftermarket crankshafts, also the only reason someone would buy a tomei crank is if it were a stroker, which the rb30 does with it's capacity.... I'm not even going to list the aftermarket support for the whole RB series of engines, but there are plenty of big brand companies producing quality products = and superior to the Japanese product which will work with the 3l