I don't think the alignment is critical. As long as the grooves go through the oiling hole, that's all that's important. The purpose of them is to allow a larger surface area of oil between the inside of the rocker arm (or bushing) bore and the shaft. That's why the standard stamped paddle rocker shafts don't have nanner grooves. They just aren't necessary there. I'm not certain every adjustable rocker shaft had nanner grooves, but they are a really good idea.
