gt to cobra swap

I have a 99gt convertible. It now has a 2003 motor and 6 speed from a supercharger cobra. The wiring and computer in the front half and the gage cluster are from an 04 cobra. I am looking for someone who has done this swap and can tell me any little quirks I might have.
What is the eletricl box under the dash on top of the trans tunnel. There are other questions but looking for someone with a back round in this.
I need to get this car on the road again I am going crazy driving a honda. Before you clown the honda it will smoke most car's out there. BUT JUST THE SAME IT'S A HONDA AND I HAVE IT FOR GOOD MPG. Over 200hp at the wheels in a 2360lbs car is fun if it still get's 31mpg average

The honda is a 92 eg hatch with a stock 97 jdm type r after market header and intake stock type r b pipe 201hp to the wheels yes it's been tuned lol 30.9 mpg last time checked. fast little thing it also has a 75 shot venom kit, if it's got a gas peddle I'll drive it if it's fun.
The t56 bolted right in but i had the trans bracket from the 03-04 I have not stuck the drive line in but I am putting in an irs and have an aluminum driveline to go in. The car is getting everything 03-04 as far as drive terrain. It's takin 4 or 5 years to collect up the parts so far.

Got it running friday night. Took it out last night. why do people with new camaro's think they are above everyone? LOL he should had bought a stang this thing is fast love it.