From what I've seen, alcohol can pick you up between 2 and 4 tenths. It seems to pick up lower compression motors up more than higher. So if your at 11:1 and go alcohol, I would expect 4 tenths, if your at 13:1, I would expect 2 tenths. (in 1/4 mile)

Injection is worth some on it's own, so I would look for somewhere around 2 tenths in the 1/4 with injection.

Everyone see different results, this is just what I've seen over the years and with my experience.