mufflers
ipc/huth has mufflers that is suposed to be stock sounding and being the right size but those are very much mufflers made to be universal aplication, but the prices are pretty god, i would have a look at yearone if you realy want it to look and sound stock.. just checked there website
www.yearone.com and i am not convinced about what they say is stock since the only seam to ofer 2 1/4" and 2½" mufflers wich is wrong as far as i know for an A-Body Mopar an Abody mopar with a 340 is suposed to have 2 1/4" inlets and and 1 7/8" or 2" tailpipes