[blykins]

You are correct in that it will make great power and torque; more than enough to get you killed in a Cobra. Probably around 400 hp and 450 lb-ft.

If you already have a 390, a top end upgrade would be a great and less expensive way to go.

The con here is that I've tried to put similar packages together for Cobra guys and never got a nibble.... That may be a function of horsepower or it may be a function of foreseeable resale value.

Edelbrock's package is a "universal" package, meant for 390's, 428's, etc. I offer similar packages that would be more custom tailored to a 390 in a Cobra.

A 750 mechanical secondary carb would probably be just about perfect.