Hi Sfort,
Sorry for not responding sooner.
I have had a lot of success with the factory FI setup but then again, this is in my comfort zone. You can do some improvements by putting in a slightly hotter cam but there is a limit that you can go before the computer gets too tricky to tune. I've seen some LT1's with too hot of a cam and the dang thing just won't idle right - but goes down the track like crazy. For me, I want a total package in my street rod so opt for a closer to stock cam.

Regarding the 94 versus the 96 - The Block and the heads are essentially the same. The biggest difference is in the computer the knock sensors, and the oxygen sensors. The older knock sensors are very sensative and throw some false codes when I step on it. Newer version knock sensors are better. The knock sensors are NOT interchangable even though some websites may lead you to believe this.

The Stock intake manifold on the '94 is a 48mm. I put on a 52mm without any other modifications. You can buy a 58mm throttle body but then you need to have a new intake. Some claim HP gains by just going from 48mm to 58mm and logically that would make sense but there are other changes that would result in more improvements.

Lastly a good website for reference is www.shbox.com as there are lots of good information on this site.

Hope this helps some.
Jerome