I have a 289 wich is upgraded with new 4 port carb., new intake, cam and lifters and a silent dual exhaust system. AS a "final touch", I have been advised to upgrade the stock manifolds. I have been given several alternatives: 1. Try to find HiPo manifold (difficult here) 2. Use a 351 manifold (do they really fit a 289?) 3. Use shorty headers As I am not a fan of load engine noise, I am a bit sceptical to headers. Someone hinted my about header-wrapping, but I don't know what that does to sound. Advice me please.