You need to pick a direction to go, and stick with it. Right now you're more confused than a blind seagull in a fish market.

Use the whole serpentine accessory package for the V6, A/C compressor and all. No point in paying some aftermarket huckster for stuff you can fabricate yourself. HEI is an absolute necessity, and there's no better system than the original equipment GM HEI system with the vacuum advance. No computer is necessary. Port fuel injection will open up an entire new can of worms, requiring a computer, and a whole bunch of sensors. I try to use the KISS principle on projects, especially where a budget has to be considered. If you've got more money than brains, the sky is the limit.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!