Stock 340 hipo manifolds are hit or miss, Some fit some don't, The way the drivers manifold curves back towards the head it hits the head, i used a header flange as a spacer

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]