I don't know offhand what the BBK setup drops the car... most are like an inch to an inch and a half tops. If they are indeed the stock shocks and struts you are definately going to want to get something stronger. KYB's or Tokicos would be a good choice. It might even be hanging lower due to the stock shocks and struts.
The only thing I know about Cobras is that I want one

There are some Cobra owners here that can fill you in on the rest.
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!