You're not gonna get much of a power gain, but you will feel the difference compared to that d15b2. Its gonna feel a lot faster to you because of how slow that thing is.

The mpfi conversion is gonna feel a whole lot better too, more responsive.

For the ITB's you're going to HAVE TO have MPFI for the ITB's.

Got no idea on how much whp and torque its gonna be but very interested on the build I was going the same way before my car got stolen. Keep us updated on how it goes.