[chr2002ca]

Depends on the manifold. If you're just swapping out the carb for one of those EFI throttle bodies that has the injectors in it, you won't see too much difference other than cold starts, MPG improvement, and easier tuning. Switch to an MPFI setup with separate injectors for each intake runner in the manifold and you're going to see further improvement in throttle response also and MPG. It's not until you change the manifold to a tunnel style unit with the throttle body mounted on the front(like an Edekbrock Pro-Flo XT) will you see any noticeable increase in horsepower. So I agree with others. A straight carb-to-EFI swap using the same manifold will not make much difference in horsepower, with the slight edge on peak HP going to the carb. Several magazines have proved that already also. I just recently spent some $K's to swap from carb to an MPFI setup and I could care less about extra HP because this EFI stuff is the bomb. Well worth it once you get all the sh_t plumbed and wired.