I have the full TTI exhaust (2.5"), from headers all the way back, on the 350HP 440/727 in my '67. Motor has been rebuilt: .030 over, with a mild cam, basically stock heads, Edelbrock Performer intake and Holley Sniper EFI/Hyperspark ignition. Gears are 3.23. (For the haters, I know I don't...