Header/sidepipe exhaust recommendation

[onecrazygearhea]

I need a recommendation. I have a 355 sbc with ported aluminum heads (220cc intake runners, 10.5:1 compression), Comp Cams XR286R solid roller cam, forged bottom-end, Edelbrock Victor E manifold, Holley 1000 cfm throttle body, 36lbs/hr injectors, and a F.A.S.T. sequential fuel injection ECP. The engine has the potential for 500+hp but a free flowing exhaust system is key to passing that number. I am looking to put this in a Factory Five roadster but despite what their website says FFR could not give me any recommedations for exhaust headers and side pipes. Anyone out there tried putting a small-block chevy in a cobra? Don't be afraid to speak up. I'm looking for something with a minimum of one and three-fourths inch primaries and merges into a 3 inch collector. Any suggestions??

I know a bunch of you guys out there are cringing at the thought of a chevy powerplant in a cobra, but I already have the motor.

Thanks.
Onecrazygearhead