Supposedly, the Hooker Super Comps are a bolt on fit but I haven't tried those. I haven't tried the Heddmans either. I run some old 1 1/2 tube tri-y's that I've had for 10 years with my Windsor Jr heads. Everybody including Summit and World Products said there was no way they would fit so I made them fit, LOL. I had to grind one small spot on the passenger side flange so the spark plug would go in and I had to heat and tap in one header tube a small amount on the driver side or it would burn that plug wire. Thats it. They work fine. If you port the exhaust side the 1 1/2 tubes won't be large enough for your heads though. I need some better headers which I am hoping to get next month. I just wish I knew what to get for it.