What else will it take.....
That's two totally different things. To be honest, a C5 Coupe A4 can be a lot faster than a C5Z in the 1/4 really easily. You just need to make up for gearing, weight and 70HP.
So, my suggestion would be to port your stock 241s or get a set of ported LS heads, get a 224R or 228R cam, get an LS6 intake, and change your gears to 3.73s. CAI and tune and you'll be going far faster down the 1/4 than a stock 2002+ Z06.
You'll make about 380-390RWHP through the automatic. The 3.73s will wake the car up BIG time and put you on par with the weight/gearing of the Z, and you'll probably run into the 11s.
You can do that all cheap if you do the work yourself. Best of all, that will all smog no problem, and you probably won't lose as much MPG as you would putting a stall in.
Just my 2 cents.
EDIT: Just read that you already have the intake and the heads... You're almost done. Just need the cam, CAI and gears.
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I ran a 221/221 575 575 112 in my 98, very nice little cam.



