Warpspeed a 4088 is a good choice, there is a guy from St Vincent, named Sherman he did 10.3 @133 mph using a pte 6466 @ 25psi which is roughly the same size as the 4088, my turbine wheel close in size to the gt40 as well and from the seat of my pants 4500-8500 is what my power curve feels like. The sr16 cams are known to improve spool up as well and also because of less aggressive ramp rates you can rev them higher on the stock valve train in contrast to the stock 264/268. the low lobe is also smaller so i believe this will lead to a quieter car and better fuel economy as well.