Thats crap dude the VG30DETT is a great engine....theres no way in hell your rb20det is a match for it. One of the guys in the 300zx club runs low 12's and on the motorway they are on a par with the GTR.
In the states they do some crazy things with these engines....maybe you can beat a non-turbo Z?? but a decent tt is gonna have you for lunch.