if you are still running 2.73 gears there is about 4 tenths going to 3.73s. i picked up 7 back when my car was running in the 14s. of course the faster you go the harder it is to pick up a bunch on one single thing. i would think at least 4 tenths for the gear swap.
86 camaro mike ford racing, FTI, moser, double aa performance
Small block single bar plate on 275s
1.26 60 ft