[blykins]

I would always advise using a good billet flywheel.

If you don't have one, I have good pricing on McLeod, RAM, and PRW flywheels. All good quality.

If you're not using a 11.5/12" pressure plate, I have access to some lightweight billet steel flywheels that are inexpensive.

For most applications, a heavier steel flywheel is just fine, especially with a Cobra that's running higher rearend gears and a cam that's a little on the rowdy side. I've ran aluminum wheels in Cobras and you can tell the difference when you're taking off from a dead stop.