If you go with the GT40 Irons used, I highly suggest picking up a used Ford Explorer intake from a 1996-2001 Ford Explorer.
The stock E7 heads flow right around 155cfm max. The stock intake flows about 136cfm. It's already weak for the combo. If you're really pressed for cash after the purchase of the GT40's, port the stock lower intake. A ported lower will really help it out. The Explorer intake flows about 190cfm, and so does the GT40 intake. The GT40, Cobra, and Explorer intakes all use the same lower, but slightly different uppers that result in the GT40 and Cobra flowing 200cfm. I think you can pick up an Explorer upper for about $200-250 used. The Cobra intake will run you $250-300 used.
Definately note the GT40P "Explorer" heads and the GT40 Irons "Cobra" heads are not the same. The GT40P's, while better, will require the use of special $200 headers which aren't worth your money at this point.
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