With a stock turbo, injection pump, injectors, etc, I seriously doubt that the head bolts are the weak point. You're not likely to get the kinds of power levels that would lift the head.

If you can handle the expense I'd suggest that you install the manual boost controller and take the car to a dyno so you can adjust for max rear wheel HP. Make sure the shop has a dyno with a PAU (power absorbtion unit) - this means a Mustang, SuperFlow, or newer DynoJet. Some of the older ones only impart a load during acceleration - not what you want. In our area it's about $100/hr depending on how much input you need from the shop's experts. An hour should let you dial it right in and then you're not guessing. You can monitor EGTs and make sure you're staying safe, too. As I said, you CAN do this on the road but it's hard to monitor everything and still drive safely (a big concern).

Dan