Pagz = 23K,when club202 died I had a name change on most other forums so have chaged it here also!.
Buying another engine,building and tuning prior to installation sounds ideal,you might want to build the external bits on your original one for fitment though.
If you do go with the turbo setup spend some time on the Cam setup before tuning,degree the cams and speak with cam tuners for there opinion,you might/will want to remove some of the overlap.