A T66 may be a little too big. The biggest turbo on that motor I know of on stock fuel is a T60-1. It is not trimmed much different than a T04e-60. That turbo comes standard with many kits. You can spec it however you want though. I would try a T04 with a .6 to .7 or so exhaust a/r and similar compressor side. The housings can be changed. For fuel, you can run an additional injector controller - it must be able to sense boost at least. I run the Haltec H5. You need a high pressure, higher flow fuel pump like the TT. I'm not a fan of rising ratio mechanical FMU's but they can be used too. The stock ecu can not really be modified other than splicing an O^2 sensor to get one. To pass emissions, leave your egr,pcv, and related systems intact. Put your cats or some hi flow cats on v bands and get a test pipe to swap out easy. Turn the boost and cut in way down during testing and make sure the car is nice and hot. Also, run only the best fuel you can find.
I've hit 20 psi before on 10:1 compression wich is stock for the GE. The GTE is 8.5:1. There is a few built GE's running 30+ psi. But your motor won't want to go that high. 10 to 15 psi is safe with the right tuning and fuel.