Bonnevilles react a bit differently to mods, and how much KR they see, then GP'* do (at least the 00+ do, not sure if it is heavier weight or TM issues). You may very well be able to run a 2.8 when your done but starting large and moving down while testing is the smart thing to do. You definately need to upgrade injectors before going below a 3.0 pulley.
Be sure you get a CASE learn done after the cam swap. And wait until you put the new PCM in to do it so you don't have to do it twice
Good luck with the build. Hope to see that high on the top 25 list