I installed these manifolds on a '67 Mustang Coupe, 351w, C4 Transmission, Manual Steering, No Power Brakes. They came in from the bottom fairly easily and have a lot of clearance on the driver's side. The passenger side has a gap but fits closer to the struts. The only problems were that a tube had to be pushed in slightly to release the bipod arm and one of the tubes didn't push out properly and it wasn't easy to insert the bolt. The rest are very satisfied.