Check out & save these sites:
http://www.gnttype.org/maint/basics.html (Spring Cleaning Guide)
http://www.gnttype.org (Check out the drop-down feature labeled "Resources" upper right side)
http://www.vortexbuicks-etc.com/index.html
http://www.vortexbuicks-etc.com/howto.htm
http://www.vortexbuicks-etc.com/TuningBasics.htm
http://www.vortexbuicks-etc.com/combinationexamplesNew.htm
The SLIC (Stock Location Inter Cooler) can be difficult to work around if you have big arms, bad back, etc. The SLIC inlet is the choke point. Often it is cut away & a new "Dutt Neck" is welded into place to remove the restriction. Another option is to remove the SLIC & replace it with an FMIC (Front Mount Inter Cooler). This relocates the IC in front of the radiator & opens up the engine bay. Usually a high quality FMIC will provide for better flow & charge cooling at the possible expense of blocking air flow to the radiator. If you live in a hot climate, it may cause cooling issues.
If you are running on 91-93 octane pump gas without adding some form of octane enhancement, you will be limited to about +/-16psi of boost.
Make sure you have a Scanmaster. (Mandatory piece of equipment)
Consider upgrading the fuel pump, run a "Hot-Wire" kit to the pump, a Turbo Tweak chip, an adjustable fuel pressure regulator (AFPR) & a 160 degree thermostat. An auxiliary transmission cooler is also a very wise addition. These items enhance reliability & performance.
Read up & welcome to the world of cars that require some study.
PS. I reread your initial post & see that you already have several items I mentioned.