I would need some sort of hard evidence to back that up.
Either from a flow bench or dyno.
Better yet, from track testing.
Too many people ruin perfectly good flowing heads thinking they know more than the people that spent months designing them.
There's no power to removing the lines...only changing cross section in the port.
Unless your looking for more power, or need a larger port for a large engine, or high rpm, they can be left as is.