I am looking into buying a car off here very soon, its a 98 civic w/ boosted b18. The bottom is supposed to be built, it has 660 injectors and a t3/t4 turbo, Skunk 2 Intake manifold and forged pistons. I would like around 350-400 WHP, I was told it isn't possible without spending a good chunk on the LS head. On to the questions.

Would a B16 head help me reach that goal?

Is the head w/ cams, dizzy and LS/Vtec kit all I need?

It's tuned with Chrome, do I still need a ECU?

Whats a ballpark figure for having the head swapped at a shop?

Thanks and reps for any help