dual exhaust on a 273

My 273 has headers leading into 2.5 into Flowmaster 40s and then dumped before the rear axle. The motor is bored over some with Mopar purple shaft cam, Edlebrock 500 CFM carb, Performer intake, Accel 300+ ignition but that is all. The exhaust was already installed when I bought the car and didn't like the sound it had because the pipes was ran out the back. So I removed the pipes out the back and dumped it. My friends say now it sounds as if it has a big block in it. LOL. It isn't loud and it has that nice rumble to it that you mention. I need to have a H-pipe installed or X-pipe so if you decide what to do don't forget about that. It would be good if you go the X route.