The GT40 only makes 2-4 more HP then the Cobra, nothing you will notice. It is lighter then the Cobra but it isn't worth the $200 more.
I also favor the Holley 
but it works good for me with all the other parts I have, as stated befor you will give up more low end with the Holley on a near stock motor therefore the Cobra would be a good choice
daz95gt- try a Accufab 65mm TB and a 75mm Pro-M bullet it is a very popular combo. Some people have problems running 24# and a 75mm due toi the fuel curve of the 24# injetcors I myself haven't had any problems.
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98
[This message has been edited by Rick 91GT (edited 01-26-2001).]