Jimmy I would suggest if you are new to the engine conversion game, just grab yourself an r32 RB20det front cut and get someone to swap it all over for you as is.
I think you will be more than happy with the performance, I would estimate it to be 1 second quicker than an RB30 manual over the qtr on standard boost alone, put 14psi into it and you'll crack a 13......which is a big difference to the RB30!
I myself have Turbo'd the NA RB30 in my Skyline....