Change mufflers. With small block I picked up 2-3 tenths going from those to pypes racepros, but any straight through muffler is going to be better.

Last edited by FurryStump; 05/14/18 01:32 PM.
best of 11.24 at 119 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]