Jeff,
Brent will build you a great motor, no matter what configuration you go with.
If you have not done so already, I would recommend you ask Brent about running the motor in on a dyno to break in the cam and get some HP numbers. It will also make the first start of up the motor in your Cobra a sure thing, as you will know the motor will run and not have any issues or leaks!
For #3 … Personally, 650 HP in a Cobra seems like too much to me, but then again there are lots of guys here that have 650 HP + … and probably want more besides.
Control is all up to you. Take your time getting used to the car and don't really push it until you really get comfortable with the whole package. Be sure to point it in a straight line before you give it the boot
- Tim