I wouldn't want to mess with the N20 on a carbed car, but that's just me.
It would be cheaper to get a 87GT engine (there is one at Louie's in Champlin for $450, you can probably talk them down) and swap that in. It's got better heads, and more potential to modify. The EFI parts on the engine you can sell for a few bucks, use the headers and go to dual exhaust. Get a good intake manifold and carb and you can really pick up some power.
On the other downside, you have a 7.5" rear end. It's weak compared to the 8.8" that came on the 1986 and later GT's. Again, I think Louie's has 2 or 3 of the Fox 5.0's on hand. That means they also have the 8.8" rear ends and all that stuff too. You may want to think about talking to them on a large purchase. It'll be just as cheap as the N20 kit (when properly done), and you'll get good power, and better reliablilty out of it.
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