Rocker shaft oil passage?

Look down that bolt hole and you'll see a 2nd smaller hole that intersects the bolt hole at an angle. There's no 10' Phillips (your words) that will go down that hole. Really 10feet? The hole oil comes out of is smaller diameter than the bolt hole. Also could be the rocker shaft is clogged. Oil comes up that rocker stand and then feeds thru the shaft. Especially on something sitting that long, any oil left there from 40 years ago could be a sludge now.