Well where are you trying to go with your engine? Looks like your in the same boat as me, I am keeping mine pretty much stock and just keeping it in its best running shape.
My MSD Ignition consists of a MSD dizzy, and yes they do sell cap and rotors for our dizzys), MSD Ignition coil and MSD 8.5 wires. The 6AL ox is a waste unless you will be doing a heavily modified engine. Also running a Dyna-Mod Ignition module, stock one is crap depending on what model if you have.
Read here, post #7 onward:
http://www.fullsizechevy.com/forums...95-obd-i-ecm-pcm/348669-ignition-upgrade.html
Pump 87, you wont see ant or much of a benefit from running higher, these engines were designed to run on 87. I know some guys who have modified engines along with a tune and they do require the need of quality petro. I am also using Mobil 1 Synthetic, 5W30 along with a Mobil 1 filter and change it out every 4000K.
I Love my TB and injector spacers, installed these two together and noticed the increased throttle response right away. Both are easy installs. I would go ahead and do the "ultimate tbi mods" while you are installing these.
http://tbichips.com/ultimateMODS.htm
The fuel injectors are suppose to run around 12psi for optimum performance. But it is known the from the factory psi varied from 9-12psi, Easy way to correct this is to install a fuel pressure regulator and a gauge to monitor it I purchased a new injector assembly with injectors because mine were not looking to hot. With these new ones I have nice cone shape spray and I know the engine is getting enough fuel.
Next step after this for me, new exhaust system. Edelbrock TES headers and y pipe, Magnaflow cat and muffler. After that, electric fans and water pump and I am done.