with the mods in my sig (something like 300Hp), what kind of time will 3.42's take off? Im not sure what im running now, so just a general/common time difference will have to do.

The other thing im worried about is biting the bullet with gas mileage. I was gonna go 3.73's, but i think they would be a bit much for my daily driver. Is the gas mileage gonna be a whole lot worse, or will i even be able to tell????

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86 Z28 red,
originally LG4,
new 350,
non comp Qjet,
T-5 five speed with new clutch,
stock 3.23 gears, Edelbrock Performer intake,
crane 272H cam,
Accel 8mm wires,
Edelbrock performer cat- back,
Homemade cold/forced air intake.
KYB GR-2 struts and shocks.
Grant GT leather wrap steering wheel.
Sony X-plod stereo.
Optima 6x9's

Future mods:
NOS,
Edelbrock TES headers, hi flo cat.
4th gen interior
6 point roll cage
3.42 gears
hurst billet/plus shifter
Edelbrock STB
Telstar rims

cars i've beaten:
95' Avenger, 88 Mustang GT, 70' Mustang , 97 Dodge Ram, 94 firebird formula, 92 Mustang GT, 94' 3000GT VR4, 97' Accord Rice Rocket (just barely), countless many ricers....

if you have 3:23 now i'd be looking at 3:73 or 4:11 gears. with over drive it isn't that bad. hard to say for sure about et reductions, but i'd expect 2 tenths. mph may drop off, it's not uncommon for it to when going to lower gears.

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ICON Motorsports
1st & 3rd