a good decent f-body from 93 to 97 with low miles for its age can be found anywhere from 3000 to 7000. my t/a was 2000 with a blown headgasket, new transmission, and bad breaks. i put about 500 in the motor fixing it and 200 on brakes. i did everything myself so i had no labor cost. it now runs like it is brand new. most lt1 f bodies should run a low 14 to a high 13 if maintained. ls1 usually run mid 13s. and the supercharge question cant be answered. it depends on supporting mods, tune, boost, ect.