Call them, worth a shot, they might do it with a restocking fee, pretty good idea imo.
Basically you wanted 350kw, imo thats way too much for the street, 300 is the limit for rwd before you just get slower (more lag, less traction, very hard to drive) if you want 1/4 mile times and use slicks then sure that power is useable.
If it is a daily driven street car aim for 250-300kw with the smallest turbo that will make that power, I would be looking at the 0.82 GT3071 for this, if you use E85 then you can make even more power, I think I've heard of people doing 320kw with E85 on a GT3071
not to mention 250-270 doesn't need an engine rebuild, where as if you want to do 350 year in year out reliably you do.
1/4 mile lag isnt a big deal as you can smash the limiter on take off and then you are flat the entire way, on the street you are using half throttle and low revs etc.