Mark,
it sounds like the main thing you need to do is get good headers. almost every small block build, especially the 383's, like to have equal length 1.75" header tubes and at least 2" dual pipes. the smaller the pipes the more low end your motor will have, and obviously the bigger pipes are suited better for high rpm. i think your best bet would be equal length 1.75" headers with thick flanges and a good 2.25"-2.5" exhaust pipe. that configuration should flow up to 350-400hp, anything over that then i would go for 3" up to 500hp. the only problem is rear ground clearence with 3" pipe, under the diff, and bumpy roads. i drug the **** out of my 2.5" stuff, so the side-pipes were sort of a last resort. if looks is important, then go ceramic coated! they hold there nice clean look, and if you get mud, oil, dirt, etc. caked on them, some Mother's metal polish and they look brand new in no time. good luck with the project, Brian.
