Its realy hard to just guestamate those things.
Right now my GT stock runs 108-110mph in a 1/4mile, not sure on time though...
My SE is quicker/faster if I can keep traction with cold street tires. Tonight I got in the mid 13's , the cold weather.

I'm not sure how fast as the speedometer only goes to 120mph.
The problems that you will have with the stage II alone would be your trans flopping out on you.
Stage III is wasteful for street use.
You will be lucky if you get 18mpg with the stg II,
stg III might fall down to 12-15mpg.
Gas went up 35 cents overnight up here