exhaust next

can look here , pricey but good
http://www.accurateltd.com/67-74-A-Body-Complete-Systems-Big-Block-or-Small-Block_p_186.html

a bit less
http://waldronexhaust.com/cart/index.php?main_page=product_info&cPath=61_36_125&products_id=4633&zenid=f37775821f6783b017b88e936043fcfc