What do you already have done to the motor?
t76 billet, with a spool valve, (turbonetics)
im running a walbro with a boost a pump
never got to the track
Just saying that 700whp could be done with a T67, and no spool valve.
I have a similar turbo on one of the supras I built last year... it makes a touch under 950whp.... PT76 GTS T4 .84