Jody, you can let me borrow your BS3, I'll install it and get it all figured out by the time you're ready for it.
The problem will be getting it back from me!
My FAST is working just dandy. I'll probably wait another generation before I consider upgrading. Right now I consider the newest units out there (BS3 and FAST EFX) to be "incremental upgrades"; i.e. small improvements here and there but no major compelling reason to yank mine out.
I will admit though the WB02 "self tuning" fuel maps offered by the new units will save a LOT of time tuning, especially for someone who hasn't done anything like that before. They won't save your motor if you command a 30% VE at 6700 rpm and 20 psi of boost, but it will sure make it nice and easy for the final tweaks.
It will definately take more time to tune a turbo motor since it can run in a LOT more areas of the map; i.e. low rpm with high boost, such as a heavy load in overdrive. Since boost will be relative to engine load you'll be tuning cells you wouldn't normally get to with any other engine, and my guess is you'll really have to pay attention to the high boost / low rpm areas (i.e. stabbing it in overdrive) and watch the timing to keep detonation away.
Nothing difficult/impossible, just more time consuming since turbos "open up" a lot of areas on the map that most other engine combos will never operate in.