Welcome to the boards, "sore"!!! You came to the right place!!! Sounds identical to the post I made about 3 months ago, when I first came to Stangnet.
The answer is: If you are planning to run the OE cam, you won't have a problem. I assume most other things can be upgraded without much worry. (Heads, intake, headers, etc.)
Also, the A9L is not as "smart" as the 94-95 computers. That can be good and bad. Wouldn't recomend it. You'll still hit a "ceiling" with that computer. As well, I'd bet that the harness would be difficult to procure. The computer will run about $100, on Ebay.
The ultimate solution is to get a "self-tuning device" such as the twEECer (pronounced tweeker) or other device.
If you hang out here long enough, you'll find that your very first "upgrade" should be to 3.73 rear gears for a manual car and 4.10 rears for an auto. If it's an auto, the trans computer can also be controlled by the twEECer.