Re: 1991 Crown Vic upgrade...
For the 302s, 1980-1983 or 1984 (can't remember) was carbureted, 1985 (and 1984?) was CFI, which is similar to GM's throttle body injection, and 1986+ was EFI.
None of the CV/GM/TC 5.0s made much power. On a chassis dyno, it only pulls between 120-130hp and 220-240lb/ft at the wheels. The torque peaks out right at 2,000 RPMs. It's very well-tuned, though, because the torque pulls up just enough to really get that yacht moving. I was able to rip my tires loose at the drop of a hat when I first got my wagon.