Beginner's Bucks-Down /6 Build...Suggestions Welcome

Based on SlantSixDan's post here

http://www.slantsix.org/forum/viewtopic.php?t=44170

"I like my cars quiet, so I get my exhaust unrestriction by using a larger-than-stock, stock-type muffler. The stock unit was really tiny, with 1¾" inlet and 1½" outlet, in a 3" × 7" body. Tiny! You can go to a much larger '95 Chev Caprice item with 2¼" inlet and outlet in a 4" × 9" body. MUCH better flow and it'll have a nice note to it, but it'll still be quiet and drone-free."

I like the idea he put forward concerning muffler choice, though I'd rather not use a GM part.