Thats what we had back on our old late model stock car, 357C 12:1 the 180's over the top headers buzzing @8K was a sound to behold.
here's a pic like the ones we used
http://www.fordmuscle.com/forums/garage/486839-180-degree-headers.html
All Right You Sons-a-Bitches, Let's Have a Race! Smokey Yunick