So I tried too mock up my Headers and intake to my Aussie head on the Pre-200 Build I got from Orlando . The header from AU I got 13 years ago is all warped out of place . That was a bust ! Then I moved on to the intake and I have to tap thread in three of the bottom holes in the head. And the head bolt in the rear oil passage for the rockers would not seat all the way down . Any reason why guys ? I did not take pictures of header . Me and the wife got busy trying to figure it out .