a standard stroke rb26 with a t04z wouldn't be as bad as some people think
as long as you keep the needle a bit above 4000rpm it will sit you right back in your seat in any gear and when you swing a rb26 to 8500-9000 thats a lot of revs to play with
driving a Z on the street you dont even have to wind the revs that hard, i was changing at around 7500rpm most of the time and the next gear sits you back in your seat straight away
saying that i would go a gt3076r or 3082r with a 0.8x bum if you wanted to track a lot, you should be able to make 350-370rwkw and be bullshit responsive and trust me a GTR with that much power is fvcking quick...
forget the gt35r with either a 0.8x or 1.0x bum, if you want more power go a z, you loose a tiny bit of response but gain a huge amount of mid range and top end