Yeah, just let CRD worry about it, they have done it many times before and will do it many times again
To actually fit the Nitto 3.2 to a RB30 block is a bore and hone and a line bore for the crank and assemble, many inlarge the head bolt holes to 12mm, i didn't do that as not 100% neccasary, what takes time is as Duncan said getting it to suit the 4WD application