A better question is how much you want to spend ..
The motor that came out of my old ta22 cost around $2500 to build.
Youd end up spending a good grand at least to get the head and pistons happening - IF you got it done right hand got forgies ..
If you dont want to spend that much - you could always look at a long term engine swap like a 3tgte ( 1.8lt turbo twin cam ) that would weild much better HP figures .. Mind you youd need to look at swapping the GB to the w55 that usually comes with it - and a diff upgrade ..