Sorry to hear of your problems to date.
I think most people on here have been stung by the multitude of dodgy workshops around.
If you are still trying to find a reputible and honest w/shop Dan at ERD in Stapylton is the king.
He also has Shaun and Rick from EFI Performance sharing his workshop, he can fix it , Shaun can tune it.
He has built my R34 GTR with 30/26 to a standard few could match, I have tried most of the so called big name w/shops in Brisbane
only to be cheated time and time again.
But dont take my word for it, ask around, try the Qld skylines forums and see where they take there cars.