[speedfreak]

Your rear gears are very likely 2.73s with 3.08 being optional for 5-speed cars. I'm not sure, but automatics may have been available with 3.27s also. If you drive alot on the highway at 55mph+, then 3.55s might be ideal, but you have a heavier 'vert, so I'd lean toward the 3.73s. There is only like a 200rpm difference at 70mph in 5th.

For the mods you listed:

1. Long tube headers are great. They are harder to install and you need a special H-pipe. If the H-pipe is not custom made with cats, I dont know of an aftermarket one that has them.

2. Dont bother with a "cold air" intake unless you want it for looks. Your stock one already is a cold air intake. At the most get under the fender and pull out the silencer box. Maybe get a K&N drop-in filter.

3. A 76mm MAF will in fact help. Your stock one is smaller than the throttle body.

4. Typhoon intake will give the most gains, but will really shine with a TB, MAF, and cam. Doing a port clean up on it will help also as they are a little lower quality than Edelbrocks. Also worth mentioning is a Cobra or Explorer intake. The Explorer flows the same as the cobra and can be had for less than $250 used.

5. 65-70mm TB will be about right. 75 is better matched to a stroker or blown car.

6.Underdrives are a good idea, but its possible you'll have ide-speed charging problems since the alternator will be spinning slower. Dont plan on an electric fan unless you get a 130 amp 3G alternator conversion.

You might also consider an E-303 or B-303 Motorsport cams. They seem to work well with stock heads and provide some room to grow. The biggest bottleneck in your engine will be the E7 heads.

I suck at guesstimating power, so I'll just say that with the mods in my sig, I expect 270rwhp which is equal to your crankshaft goal. Keep in mind I have heads, but not an intake.