Just installed a set of the Edelbrock SDT mufflers on my 1965 stepside. And the sound is absolutly awsome
!. I am running a 88 350 sbc with a zz4 cam and small tube shorty headers, 2 1/4" pipe along with a H pipe. There is just a nice mellow note in the cab, but outside it has a great throaty sound that reminds me of the early big CID muscle cars. Sound is allways hard to describe, and there is a edelbrock website that has sound clips to listen to, but I can tell you they do not do these mufflers any justice. Two thumbs up in my opinion. Here is the website if you would like more info, also includes sound clips.
http://www.edelbrock.com/automotive_...mufflers.shtml