Spintech Pro streets
I would definatly go with long tube headers, either hooker supercomps or headman elites. no x or h pipe and either 1 chamber flowmasters if the cam has less than .550" lift and spintechs if the cam is between .555" lift and .600" lift. if the cam is bigger than .600" lift then any muffler will rock your sox off.
I don't know what it is about the lift and magnaflows but a buddy of mine had a 383" windsor, EFI, trick flow r heads, and a ~.670" solid roller and the thing sounded like a go kart at idle.
Nice under WOT but the idle was like eh, especially for something that looked like a show car.