The stock 340 head pipe on driver's side is 2 inches off the manifold with a giant pinch to clear torsion bar at least thats how original pipe was. Then you have original chrome tips that are around 1 5/8 inner diameter choking flow. The original 2 1/4 system choked them down. A true 2 1/4 system no pinches or chokes anywhere on stock cammed 340 yeah would be fine....