I ran the 5903's Hooker comps with some small dempling on the #8 tube due to angle plug clearance, the Bulldogs may fit betterm I was thinking they used stock eshaust location, where eddys are moved 3/8's or so. Also the header collector was tight near the driver side orsion bar, this was in a 69 B body with RB engine. spark plug changing sucked but you get faster after doing it a few times.